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4 pages, 195 KiB

Open AccessEditorial

Translational Research of Zoonotic Parasites: Toward Improved Tools for Diagnosis, Treatment and Control

by Vito Colella, Rebecca J. Traub and Robin B. Gasser

Pathogens 2021, 10(11), 1416; https://doi.org/10.3390/pathogens10111416 - 1 Nov 2021

Cited by 1 | Viewed by 1813

Abstract

A range of factors, including social, demographic and economic transformation and human-induced environmental changes, are influencing the emergence or re-emergence of zoonoses, posing new challenges in how we detect, treat and prevent such diseases [...] Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

Research

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8 pages, 270 KiB

Open AccessArticle

Mosquitoes (Diptera: Culicidae) in the Dark—Highlighting the Importance of Genetically Identifying Mosquito Populations in Subterranean Environments of Central Europe

by Carina Zittra, Simon Vitecek, Joana Teixeira, Dieter Weber, Bernadette Schindelegger, Francis Schaffner and Alexander M. Weigand

Pathogens 2021, 10(9), 1090; https://doi.org/10.3390/pathogens10091090 - 26 Aug 2021

Cited by 5 | Viewed by 2270

Abstract

The common house mosquito, Culex pipiens s. l. is part of the morphologically hardly or non-distinguishable Culex pipiens complex. Upcoming molecular methods allowed us to identify members of mosquito populations that are characterized by differences in behavior, physiology, host and habitat [...] Read more.

The common house mosquito, Culex pipiens s. l. is part of the morphologically hardly or non-distinguishable Culex pipiens complex. Upcoming molecular methods allowed us to identify members of mosquito populations that are characterized by differences in behavior, physiology, host and habitat preferences and thereof resulting in varying pathogen load and vector potential to deal with. In the last years, urban and surrounding periurban areas were of special interest due to the higher transmission risk of pathogens of medical and veterinary importance. Recently, surveys of underground habitats were performed to fully evaluate the spatial distribution of rare members of the Cx. pipiens complex in Europe. Subterranean environments and their contribution to mosquito-borne pathogen transmission are virtually unknown. Herein, we review the underground community structures of this species complex in Europe, add new data to Germany and provide the first reports of the Cx. pipiens complex and usually rarely found mosquito taxa in underground areas of Luxembourg. Furthermore, we report the first finding of Culiseta glaphyroptera in Luxembourg. Our results highlight the need for molecular specimen identifications to correctly and most comprehensively characterize subterranean mosquito community structures. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

8 pages, 590 KiB

Open AccessArticle

Optimization of DNA Extraction from Field-Collected Mammalian Whole Blood on Filter Paper for Trypanosoma cruzi (Chagas Disease) Detection

by Bonnie E. Gulas-Wroblewski, Rebecca B. Kairis, Rodion Gorchakov, Anna Wheless and Kristy O. Murray

Pathogens 2021, 10(8), 1040; https://doi.org/10.3390/pathogens10081040 - 17 Aug 2021

Cited by 7 | Viewed by 3506

Abstract

Blood filter paper strips are cost-effective materials used to store body fluid specimens under challenging field conditions, extending the reach of zoonotic pathogen surveillance and research. We describe an optimized procedure for the extraction of parasite DNA from whole blood (WB) stored on [...] Read more.

Blood filter paper strips are cost-effective materials used to store body fluid specimens under challenging field conditions, extending the reach of zoonotic pathogen surveillance and research. We describe an optimized procedure for the extraction of parasite DNA from whole blood (WB) stored on Type I Advantec Nobuto strips from both experimentally spiked and field-collected specimens from canine and skunks, respectively. When comparing two commercial kits for extraction, Qiagen’s DNeasy Blood & Tissue Kit performed best for the detection of parasite DNA by PCR from Trypanosoma cruzi-spiked canine WB samples on Nobuto strips. To further optimize recovery of β-actin from field-collected skunk WB archived on Nobuto strips, we modified the extraction procedures for the Qiagen kit with a 90 °C incubation step and extended incubation post-addition of proteinase K, a method subsequently employed to identify a T. cruzi infection in one of the skunks. Using this optimized extraction method can efficaciously increase the accuracy and precision of future molecular epidemiologic investigations targeting neglected tropical diseases in field-collected WB specimens on filter strips. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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13 pages, 2161 KiB

Open AccessArticle

First Evidence of Function for Schistosoma japonicumriok-1 and RIOK-1

by Mudassar N. Mughal, Qing Ye, Lu Zhao, Christoph G. Grevelding, Ying Li, Wenda Di, Xin He, Xuesong Li, Robin B. Gasser and Min Hu

Pathogens 2021, 10(7), 862; https://doi.org/10.3390/pathogens10070862 - 8 Jul 2021

Cited by 4 | Viewed by 2506

Abstract

Protein kinases are known as key molecules that regulate many biological processes in animals. The right open reading frame protein kinase (riok) genes are known to be essential regulators in model organisms such as the free-living nematode Caenorhabditis elegans. However, [...] Read more.

Protein kinases are known as key molecules that regulate many biological processes in animals. The right open reading frame protein kinase (riok) genes are known to be essential regulators in model organisms such as the free-living nematode Caenorhabditis elegans. However, very little is known about their function in parasitic trematodes (flukes). In the present study, we characterized the riok-1 gene (Sj-riok-1) and the inferred protein (Sj-RIOK-1) in the parasitic blood fluke, Schistosoma japonicum. We gained a first insight into function of this gene/protein through double-stranded RNA interference (RNAi) and chemical inhibition. RNAi significantly reduced Sj-riok-1 transcription in both female and male worms compared with untreated control worms, and subtle morphological alterations were detected in the ovaries of female worms. Chemical knockdown of Sj-RIOK-1 with toyocamycin (a specific RIOK-1 inhibitor/probe) caused a substantial reduction in worm viability and a major accumulation of mature oocytes in the seminal receptacle (female worms), and of spermatozoa in the sperm vesicle (male worms). These phenotypic alterations indicate that the function of Sj-riok-1 is linked to developmental and/or reproductive processes in S. japonicum. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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16 pages, 611 KiB

Open AccessArticle

LAMP Assay for the Detection of Echinococcus multilocularis Eggs Isolated from Canine Faeces by a Cost-Effective NaOH-Based DNA Extraction Method

by Barbara J. Bucher, Gillian Muchaamba, Tim Kamber, Philipp A. Kronenberg, Kubanychbek K. Abdykerimov, Myktybek Isaev, Peter Deplazes and Cristian A. Alvarez Rojas

Pathogens 2021, 10(7), 847; https://doi.org/10.3390/pathogens10070847 - 5 Jul 2021

Cited by 12 | Viewed by 6626

Abstract

The detection of Echinococcus multilocularis in infected canids and the environment is pivotal for a better understanding of the epidemiology of alveolar echinococcosis in endemic areas. Necropsy/sedimentation and counting technique remain the gold standard for the detection of canid infection. PCR-based detection methods [...] Read more.

The detection of Echinococcus multilocularis in infected canids and the environment is pivotal for a better understanding of the epidemiology of alveolar echinococcosis in endemic areas. Necropsy/sedimentation and counting technique remain the gold standard for the detection of canid infection. PCR-based detection methods have shown high sensitivity and specificity, but they have been hardly used in large scale prevalence studies. Loop-mediated isothermal amplification (LAMP) is a fast and simple method to detect DNA with a high sensitivity and specificity, having the potential for field-application. A specific LAMP assay for the detection of E. multilocularis was developed targeting the mitochondrial nad1 gene. A crucial step for amplification-based detection methods is DNA extraction, usually achieved utilising silica-gel membrane spin columns from commercial kits which are expensive. We propose two cost-effective and straightforward methods for DNA extraction, using NaOH (method 1A) and InstaGene^TM Matrix (method 1B), from isolated eggs circumventing the need for commercial kits. The sensitivity of both assays with fox samples was similar (72.7%) with multiplex-PCR using protocol 1A and LAMP using protocol 1B. Sensitivity increased up to 100% when testing faeces from 12 foxes infected with more than 100 intestinal stages of E. multilocularis. For dogs, sensitivity was similar (95.4%) for LAMP and multiplex-PCR using protocol 1B and for both methods when DNA was extracted using protocol 1A (90.9%). The DNA extraction methods used here are fast, cheap, and do not require a DNA purification step, making them suitable for field studies in low-income countries for the prevalence study of E. multilocularis. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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15 pages, 951 KiB

Open AccessArticle

Non-Invasive Molecular Survey of Sarcoptic Mange in Wildlife: Diagnostic Performance in Wolf Faecal Samples Evaluated by Multi-Event Capture–Recapture Models

by Julieta Rousseau, Mónia Nakamura, Helena Rio-Maior, Francisco Álvares, Rémi Choquet, Luís Madeira de Carvalho, Raquel Godinho and Nuno Santos

Pathogens 2021, 10(2), 243; https://doi.org/10.3390/pathogens10020243 - 20 Feb 2021

Cited by 6 | Viewed by 3318

Abstract

Sarcoptic mange is globally enzootic, and non-invasive methods with high diagnostic specificity for its surveillance in wildlife are lacking. We describe the molecular detection of Sarcoptes scabiei in non-invasively collected faecal samples, targeting the 16S rDNA gene. We applied this method to 843 [...] Read more.

Sarcoptic mange is globally enzootic, and non-invasive methods with high diagnostic specificity for its surveillance in wildlife are lacking. We describe the molecular detection of Sarcoptes scabiei in non-invasively collected faecal samples, targeting the 16S rDNA gene. We applied this method to 843 Iberian wolf Canis lupus signatus faecal samples collected in north-western Portugal (2006–2018). We further integrated this with serological data (61 samples from wolf and 20 from red fox Vulpes vulpes, 1997–2019) in multi-event capture–recapture models. The mean predicted prevalence by the molecular analysis of wolf faecal samples from 2006–2018 was 7.2% (CI₉₅ 5.0–9.4%; range: 2.6–11.7%), highest in 2009. The mean predicted seroprevalence in wolves was 24.5% (CI₉₅ 18.5–30.6%; range: 13.0–55.0%), peaking in 2006–2009. Multi-event capture–recapture models estimated 100% diagnostic specificity and moderate diagnostic sensitivity (30.0%, CI₉₅ 14.0–53.0%) for the molecular method. Mange-infected individually identified wolves showed a tendency for higher mortality versus uninfected wolves (ΔMortality 0.150, CI₉₅ −0.165–0.458). Long-term serology data highlights the endemicity of sarcoptic mange in wild canids but uncovers multi-year epidemics. This study developed and evaluated a novel method for surveying sarcoptic mange in wildlife populations by the molecular detection of S. scabiei in faecal samples, which stands out for its high specificity and non-invasive character. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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9 pages, 740 KiB

Open AccessArticle

Antitrypanosomal and Antileishmanial Activity of Chalcones and Flavanones from Polygonum salicifolium

by Ahmed M. Zheoat, Samya Alenezi, Ehab Kotb Elmahallawy, Marzuq A. Ungogo, Ali H. Alghamdi, David G. Watson, John O. Igoli, Alexander I. Gray, Harry P. de Koning and Valerie A. Ferro

Pathogens 2021, 10(2), 175; https://doi.org/10.3390/pathogens10020175 - 5 Feb 2021

Cited by 21 | Viewed by 3325

Abstract

Trypanosomiasis and leishmaniasis are a group of neglected parasitic diseases caused by several species of parasites belonging to the family Trypansomatida. The present study investigated the antitrypanosomal and antileishmanial activity of chalcones and flavanones from Polygonum salicifolium, which grows in the wetlands [...] Read more.

Trypanosomiasis and leishmaniasis are a group of neglected parasitic diseases caused by several species of parasites belonging to the family Trypansomatida. The present study investigated the antitrypanosomal and antileishmanial activity of chalcones and flavanones from Polygonum salicifolium, which grows in the wetlands of Iraq. The phytochemical evaluation of the plant yielded two chalcones, 2′,4′-dimethoxy-6′-hydroxychalcone and 2′,5′-dimethoxy-4′,6′-dihydroxychalcone, and two flavanones, 5,7-dimethoxyflavanone and 5,8-dimethoxy-7-hydroxyflavanone. The chalcones showed a good antitrypanosomal and antileishmanial activity while the flavanones were inactive. The EC₅₀ values for 2′,4′-dimethoxy-6′-hydroxychalcone against Trypanosoma brucei brucei (0.5 μg/mL), T. congolense (2.5 μg/mL), and Leishmania mexicana (5.2 μg/mL) indicated it was the most active of the compounds. None of the compounds displayed any toxicity against a human cell line, even at 100 µg/mL, or cross-resistance with first line clinical trypanocides, such as diamidines and melaminophenyl arsenicals. Taken together, our study provides significant data in relation to the activity of chalcones and flavanones from P. salicifolium against both parasites in vitro. Further future research is suggested in order to investigate the mode of action of the extracted chalcones against the parasites. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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17 pages, 3850 KiB

Open AccessArticle

Integrative Approach to Phlebotomus mascittii Grassi, 1908: First Record in Vienna with New Morphological and Molecular Insights

by Edwin Kniha, Vít Dvořák, Petr Halada, Markus Milchram, Adelheid G. Obwaller, Katrin Kuhls, Susanne Schlegel, Martina Köhsler, Wolfgang Poeppl, Karin Bakran-Lebl, Hans-Peter Fuehrer, Věra Volfová, Gerhard Mooseder, Vladimir Ivovic, Petr Volf and Julia Walochnik

Pathogens 2020, 9(12), 1032; https://doi.org/10.3390/pathogens9121032 - 9 Dec 2020

Cited by 11 | Viewed by 3477

Abstract

Sand flies (Diptera: Psychodidae: Phlebotominae) are blood-feeding insects that transmit the protozoan parasites Leishmania spp. and various arthropod-borne (arbo) viruses. While in Mediterranean parts of Europe the sand fly fauna is diverse, in Central European countries including Austria mainly Phlebotomus mascittii is found, [...] Read more.

Sand flies (Diptera: Psychodidae: Phlebotominae) are blood-feeding insects that transmit the protozoan parasites Leishmania spp. and various arthropod-borne (arbo) viruses. While in Mediterranean parts of Europe the sand fly fauna is diverse, in Central European countries including Austria mainly Phlebotomus mascittii is found, an assumed but unproven vector of Leishmania infantum. To update the currently understudied sand fly distribution in Austria, a sand fly survey was performed and other entomological catches were screened for sand flies. Seven new trapping locations of Ph. mascittii are reported including the first record in Vienna, representing also one of the first findings of this species in a city. Morphological identification, supported by fluorescence microscopy, was confirmed by two molecular approaches, including sequencing and matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS) protein profiling. Sand fly occurrence and activity were evaluated based on surveyed locations, habitat requirements and climatic parameters. Moreover, a first comparison of European Ph. mascittii populations was made by two marker genes, cytochrome c oxidase subunit 1 (COI), and cytochrome b (cytb), as well as MALDI-TOF mass spectra. Our study provides new important records of Ph. mascittii in Austria and valuable data for prospective entomological surveys. MALDI-TOF MS protein profiling was shown to be a reliable tool for differentiation between sand fly species. Rising temperatures and globalization demand for regular entomological surveys to monitor changes in species distribution and composition. This is also important with respect to the possible vector competence of Ph. mascittii. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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12 pages, 1352 KiB

Open AccessArticle

“Begging the Question”—Does Toxocara Infection/Exposure Associate with Multiple Sclerosis-Risk?

by Ali Taghipour, Ali Rostami, Sahar Esfandyari, Saeed Aghapour, Alessandra Nicoletti and Robin B. Gasser

Pathogens 2020, 9(11), 938; https://doi.org/10.3390/pathogens9110938 - 11 Nov 2020

Cited by 11 | Viewed by 2513

Abstract

Although the cause of multiple sclerosis (MS) is unclear, infectious agents, including some parasitic roundworms (nematodes), have been proposed as possible risk factors or contributors. Here, we conducted a systematic review and meta-analysis of published observational studies to evaluate whether there is a [...] Read more.

Although the cause of multiple sclerosis (MS) is unclear, infectious agents, including some parasitic roundworms (nematodes), have been proposed as possible risk factors or contributors. Here, we conducted a systematic review and meta-analysis of published observational studies to evaluate whether there is a possible association between infection with, or exposure to, one or more members of the genus Toxocara (phylum Nematoda; superfamily Ascaridoidea) and MS. We undertook a search of public literature databases to identify relevant studies and then used a random-effects meta-analysis model to generate the pooled odds ratio (OR) and 95% confidence intervals (CIs). This search identified six of a total of 1371 articles that were relevant to the topic; these published studies involved totals of 473 MS patients and 647 control subjects. Anti-Toxocara IgG serum antibodies were detected in 62 MS patients and 37 controls, resulting in respective seroprevalences of 13.1% (95% CI: 8.2–20.3) and 4.8% (95% CI: 2.5–9.2), indicating an association (pooled OR, 3.01; 95% CI: 1.46–6.21). Because of the publication bias identified (six eligible studies), well-designed and -controlled studies are required in the future to rigorously test the hypothesis that Toxocara infection/exposure has an association with MS. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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17 pages, 2256 KiB

Open AccessEditor’s ChoiceArticle

Highly Sensitive Virome Characterization of Aedes aegypti and Culex pipiens Complex from Central Europe and the Caribbean Reveals Potential for Interspecies Viral Transmission

by Jakob Thannesberger, Nicolas Rascovan, Anna Eisenmann, Ingeborg Klymiuk, Carina Zittra, Hans-Peter Fuehrer, Thea Scantlebury-Manning, Marquita Gittens-St.Hilaire, Shane Austin, Robert Clive Landis and Christoph Steininger

Pathogens 2020, 9(9), 686; https://doi.org/10.3390/pathogens9090686 - 21 Aug 2020

Cited by 11 | Viewed by 4522

Abstract

Mosquitoes are the most important vectors for arthropod-borne viral diseases. Mixed viral infections of mosquitoes allow genetic recombination or reassortment of diverse viruses, turning mosquitoes into potential virologic mixing bowls. In this study, we field-collected mosquitoes of different species (Aedes aegypti and [...] Read more.

Mosquitoes are the most important vectors for arthropod-borne viral diseases. Mixed viral infections of mosquitoes allow genetic recombination or reassortment of diverse viruses, turning mosquitoes into potential virologic mixing bowls. In this study, we field-collected mosquitoes of different species (Aedes aegypti and Culex pipiens complex), from different geographic locations and environments (central Europe and the Caribbean) for highly sensitive next-generation sequencing-based virome characterization. We found a rich virus community associated with a great diversity of host species. Among those, we detected a large diversity of novel virus sequences that we could predominately assign to circular Rep-encoding single-stranded (CRESS) DNA viruses, including the full-length genome of a yet undescribed Gemykrogvirus species. Moreover, we report for the first time the detection of a potentially zoonotic CRESS-DNA virus (Cyclovirus VN) in mosquito vectors. This study expands the knowledge on virus diversity in medically important mosquito vectors, especially for CRESS-DNA viruses that have previously been shown to easily recombine and jump the species barrier. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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23 pages, 7313 KiB

Open AccessEditor’s ChoiceArticle

Biotic Factors Influence Microbiota of Nymph Ticks from Vegetation in Sydney, Australia

by Shona Chandra and Jan Šlapeta

Pathogens 2020, 9(7), 566; https://doi.org/10.3390/pathogens9070566 - 13 Jul 2020

Cited by 10 | Viewed by 4350

Abstract

Ticks are haematophagous ectoparasites of medical and veterinary significance due to their excellent vector capacity. Modern sequencing techniques enabled the rapid sequencing of bacterial pathogens and symbionts. This study’s aims were two-fold; to determine the nymph diversity in Sydney, and to determine whether [...] Read more.

Ticks are haematophagous ectoparasites of medical and veterinary significance due to their excellent vector capacity. Modern sequencing techniques enabled the rapid sequencing of bacterial pathogens and symbionts. This study’s aims were two-fold; to determine the nymph diversity in Sydney, and to determine whether external biotic factors affect the microbiota. Tick DNA was isolated, and the molecular identity was determined for nymphs at the cox1 level. The tick DNA was subjected to high throughput DNA sequencing to determine the bacterial profile and the impact of biotic factors on the microbiota. Four nymph tick species were recovered from Sydney, NSW: Haemaphysalis bancrofti, Ixodes holocyclus, Ixodes trichosuri and Ixodes tasmani. Biotic factors, notably tick species and geography, were found to have a significance influence on the microbiota. The microbial analyses revealed that Sydney ticks display a core microbiota. The dominating endosymbionts among all tick species were Candidatus Midichloria sp. Ixholo1 and Candidatus Midichloria sp. Ixholo2. A novel Candidatus Midichloria sp. OTU_2090 was only found in I. holocyclus ticks (nymph: 96.3%, adult: 75.6%). Candidatus Neoehrlichia australis and Candidatus Neoehrlichia arcana was recovered from I. holocyclus and one I. trichosuri nymph ticks. Borrelia spp. was absent from all ticks. This study has shown that nymph and adult ticks carry different bacteria, and a tick bite in Sydney, Australia will result in different bacterial transfer depending on tick life stage, tick species and geography. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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8 pages, 271 KiB

Open AccessEditor’s ChoiceArticle

Comparison of Diagnostic Tools for the Detection of Dirofilaria immitis Infection in Dogs

by Rossella Panarese, Roberta Iatta, Jairo Alfonso Mendoza-Roldan, Donald Szlosek, Jennifer Braff, Joe Liu, Frédéric Beugnet, Filipe Dantas-Torres, Melissa J. Beall and Domenico Otranto

Pathogens 2020, 9(6), 499; https://doi.org/10.3390/pathogens9060499 - 22 Jun 2020

Cited by 31 | Viewed by 4701

Abstract

In the last two decades, reports of canine heartworm (HW) infection have increased even in non-endemic areas, with a large variability in prevalence data due to the diagnostic strategy employed. This study evaluated the relative performance of two microtiter plate ELISA methods for [...] Read more.

In the last two decades, reports of canine heartworm (HW) infection have increased even in non-endemic areas, with a large variability in prevalence data due to the diagnostic strategy employed. This study evaluated the relative performance of two microtiter plate ELISA methods for the detection of HW antigen in determining the occurrence of Dirofilaria immitis in a dog population previously tested by the modified Knott’s test and SNAP 4Dx Plus test. The prevalence of this infection in the sheltered dog population (n = 363) from a high-risk area for HW infection was 44.4% according to the modified Knott’s test and 58.1% according to a point-of-care antigen ELISA. All serum samples were then evaluated by a microtiter plate ELISA test performed with and without immune complex dissociation (ICD). The prevalence increased from 56.5% to 79.6% following ICD, indicating a high proportion of samples with immune complexing. Comparing these results to that of the modified Knott’s test, the samples negative for microfilariae (mfs) and those positive only for D. repens mfs demonstrated the greatest increase in the proportion of positive results for D. immitis by ELISA following ICD. While the ICD method is not recommended for routine screening, it may be a valuable secondary strategy for identifying HW infections in dogs. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

8 pages, 709 KiB

Open AccessArticle

Comparison of Diagnostic Tests for Onchocerca volvulus in the Democratic Republic of Congo

by An Hotterbeekx, Jolien Perneel, Michel Mandro, Germain Abhafule, Joseph Nelson Siewe Fodjo, Alfred Dusabimana, Steven Abrams, Samir Kumar-Singh and Robert Colebunders

Pathogens 2020, 9(6), 435; https://doi.org/10.3390/pathogens9060435 - 2 Jun 2020

Cited by 19 | Viewed by 4460

Abstract

Onchocerciasis is diagnosed by detecting microfilariae in skin snips or by detecting OV16 IgG4 antibodies in blood by either enzyme linked immunosorbent assay (ELISA) or a rapid diagnostic test (RDT). Here, we compare the sensitivity and specificity of these three tests in persons [...] Read more.

Onchocerciasis is diagnosed by detecting microfilariae in skin snips or by detecting OV16 IgG4 antibodies in blood by either enzyme linked immunosorbent assay (ELISA) or a rapid diagnostic test (RDT). Here, we compare the sensitivity and specificity of these three tests in persons with epilepsy living in an onchocerciasis endemic region in the Democratic Republic of Congo. Skin snips and blood samples were collected from 285 individuals for onchocerciasis diagnosis. Three tests were performed: the OV16 RDT (SD Bioline) and the OV16 ELISA both on serum samples, and microscopic detection of microfilariae in skin snips. The sensitivity and specificity of each test was calculated with the combined other tests as a reference. Microfilariae were present in 105 (36.8%) individuals, with a median of 18.5 (6.5–72.0) microfilariae/skin snip. The OV16 RDT and OV16 ELISA were positive in, respectively, 112 (39.3%) and 143 (50.2%) individuals. The OV16 ELISA had the highest sensitivity among the three tests (83%), followed by the OV16 RDT (74.8%) and the skin snip (71.4%). The OV16 RDT had a higher specificity (98.6%) compared to the OV16 ELISA (84.8%). Our study confirms the need to develop more sensitive tests to ensure the accurate detection of ongoing transmission before stopping elimination efforts. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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11 pages, 261 KiB

Open AccessArticle

Barcoding of the Genus Culicoides (Diptera: Ceratopogonidae) in Austria—An Update of the Species Inventory Including the First Records of Three Species in Austria

by Carina Zittra, Günther Wöss, Lara Van der Vloet, Karin Bakran-Lebl, Bita Shahi Barogh, Peter Sehnal and Hans-Peter Fuehrer

Pathogens 2020, 9(5), 406; https://doi.org/10.3390/pathogens9050406 - 23 May 2020

Cited by 9 | Viewed by 3597

Abstract

Ceratopogonidae are small nematoceran Diptera with a worldwide distribution, consisting of more than 5400 described species, divided into 125 genera. The genus Culicoides is known to comprise hematophagous vectors of medical and veterinary importance. Diseases transmitted by Culicoides spp. Such as African horse [...] Read more.

Ceratopogonidae are small nematoceran Diptera with a worldwide distribution, consisting of more than 5400 described species, divided into 125 genera. The genus Culicoides is known to comprise hematophagous vectors of medical and veterinary importance. Diseases transmitted by Culicoides spp. Such as African horse sickness virus, Bluetongue virus, equine encephalitis virus (Reoviridae) and Schmallenberg virus (Bunyaviridae) affect large parts of Europe and are strongly linked to the spread and abundance of its vectors. However, Culicoides surveillance measures are not implemented regularly nor in the whole of Austria. In this study, 142 morphologically identified individuals were chosen for molecular analyses (barcoding) of the mitochondrial cytochrome c oxidase subunit I gene (mt COI). Molecular analyses mostly supported previous morphologic identification. Mismatches between results of molecular and morphologic analysis revealed three new Culicoides species in Austria, Culicoides gornostaevae Mirzaeva, 1984, which is a member of the Obsoletus group, C. griseidorsum Kieffer, 1918 and C. pallidicornis Kieffer, 1919 as well as possible cryptic species. We present here the first Austrian barcodes of the mt COI region of 26 Culicoides species and conclude that barcoding is a reliable tool with which to support morphologic analysis, especially with regard to the difficult to identify females of the medically and economically important genus Culicoides. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

14 pages, 1473 KiB

Open AccessArticle

Opportunistic Mapping of Strongyloides stercoralis and Hookworm in Dogs in Remote Australian Communities

by Meruyert Beknazarova, Harriet Whiley, Rebecca Traub and Kirstin Ross

Pathogens 2020, 9(5), 398; https://doi.org/10.3390/pathogens9050398 - 21 May 2020

Cited by 15 | Viewed by 4112

Abstract

Both Strongyloides stercoralis and hookworms are common soil-transmitted helminths in remote Australian communities. In addition to infecting humans, S. stercoralis and some species of hookworms infect canids and therefore present both environmental and zoonotic sources of transmission to humans. Currently, there is limited [...] Read more.

Both Strongyloides stercoralis and hookworms are common soil-transmitted helminths in remote Australian communities. In addition to infecting humans, S. stercoralis and some species of hookworms infect canids and therefore present both environmental and zoonotic sources of transmission to humans. Currently, there is limited information available on the prevalence of hookworms and S. stercoralis infections in dogs living in communities across the Northern Territory in Australia. In this study, 274 dog faecal samples and 11 faecal samples of unknown origin were collected from the environment and directly from animals across 27 remote communities in Northern and Central Australia. Samples were examined using real-time polymerase chain reaction (PCR) analysis for the presence of S. stercoralis and four hookworm species: Ancylostoma caninum, Ancylostoma ceylanicum, Ancylostoma braziliense and Uncinaria stenocephala. The prevalence of S. stercoralis in dogs was found to be 21.9% (60/274). A. caninum was the only hookworm detected in the dog samples, with a prevalence of 31.4% (86/274). This study provides an insight into the prevalence of S. stercoralis and hookworms in dogs and informs future intervention and prevention strategies aimed at controlling these parasites in both dogs and humans. A “One Health” approach is crucial for the prevention of these diseases in Australia. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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20 pages, 2516 KiB

Open AccessArticle

A Host-Specific Blocking Primer Combined with Optimal DNA Extraction Improves the Detection Capability of a Metabarcoding Protocol for Canine Vector-Borne Bacteria

by Lucas G. Huggins, Anson V. Koehler, Bettina Schunack, Tawin Inpankaew and Rebecca J. Traub

Pathogens 2020, 9(4), 258; https://doi.org/10.3390/pathogens9040258 - 1 Apr 2020

Cited by 14 | Viewed by 4686

Abstract

Bacterial canine vector-borne diseases are responsible for some of the most life-threatening conditions of dogs in the tropics and are typically poorly researched with some presenting a zoonotic risk to cohabiting people. Next-generation sequencing based methodologies have been demonstrated to accurately characterise a [...] Read more.

Bacterial canine vector-borne diseases are responsible for some of the most life-threatening conditions of dogs in the tropics and are typically poorly researched with some presenting a zoonotic risk to cohabiting people. Next-generation sequencing based methodologies have been demonstrated to accurately characterise a diverse range of vector-borne bacteria in dogs, whilst also proving to be more sensitive than conventional PCR techniques. We report two improvements to a previously developed metabarcoding tool that increased the sensitivity and diversity of vector-borne bacteria detected from canine blood. Firstly, we developed and tested a canine-specific blocking primer that prevents cross-reactivity of bacterial primer amplification on abundant canine mitochondrial sequences. Use of our blocking primer increased the number of canine vector-borne infections detected (five more Ehrlichia canis and three more Anaplasma platys infections) and increased the diversity of bacterial sequences found. Secondly, the DNA extraction kit employed can have a significant effect on the bacterial community characterised. Therefore, we compared four different DNA extraction kits finding the Qiagen DNeasy Blood and Tissue Kit to be superior for detection of blood-borne bacteria, identifying nine more A. platys, two more E. canis, one more Mycoplasma haemocanis infection and more putative bacterial pathogens than the lowest performing kit. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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23 pages, 728 KiB

Open AccessReview

Descriptive Comparison of ELISAs for the Detection of Toxoplasma gondii Antibodies in Animals: A Systematic Review

by K. L. D. Tharaka D. Liyanage, Anke Wiethoelter, Jasmin Hufschmid and Abdul Jabbar

Pathogens 2021, 10(5), 605; https://doi.org/10.3390/pathogens10050605 - 15 May 2021

Cited by 26 | Viewed by 5409

Abstract

Toxoplasma gondii is the zoonotic parasite responsible for toxoplasmosis in warm-blooded vertebrates. This systematic review compares and evaluates the available knowledge on enzyme-linked immunosorbent assays (ELISAs), their components, and performance in detecting T. gondii antibodies in animals. Four databases were searched for published [...] Read more.

Toxoplasma gondii is the zoonotic parasite responsible for toxoplasmosis in warm-blooded vertebrates. This systematic review compares and evaluates the available knowledge on enzyme-linked immunosorbent assays (ELISAs), their components, and performance in detecting T. gondii antibodies in animals. Four databases were searched for published scientific studies on T. gondii and ELISA, and 57 articles were included. Overall, indirect (95%) and in-house (67%) ELISAs were the most used types of test among the studies examined, but the ‘ID Screen^® Toxoplasmosis Indirect Multi-species’ was common among commercially available tests. Varying diagnostic performance (sensitivity and specificity) and Kappa agreements were observed depending on the type of sample (serum, meat juice, milk), antigen (native, recombinant, chimeric) and antibody-binding reagents used. Combinations of recombinant and chimeric antigens resulted in better performance than native or single recombinant antigens. Protein A/G appeared to be useful in detecting IgG antibodies in a wide range of animal species due to its non-species-specific binding. One study reported cross-reactivity, with Hammondia hammondi and Eimeria spp. This is the first systematic review to descriptively compare ELISAs for the detection of T. gondii antibodies across different animal species. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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24 pages, 1232 KiB

Open AccessEditor’s ChoiceReview

One Health Approach to Leishmaniases: Understanding the Disease Dynamics through Diagnostic Tools

by Ahyun Hong, Ricardo Andrade Zampieri, Jeffrey Jon Shaw, Lucile Maria Floeter-Winter and Maria Fernanda Laranjeira-Silva

Pathogens 2020, 9(10), 809; https://doi.org/10.3390/pathogens9100809 - 1 Oct 2020

Cited by 40 | Viewed by 7603

Abstract

Leishmaniases are zoonotic vector-borne diseases caused by protozoan parasites of the genus Leishmania that affect millions of people around the globe. There are various clinical manifestations, ranging from self-healing cutaneous lesions to potentially fatal visceral leishmaniasis, all of which are associated with different [...] Read more.

Leishmaniases are zoonotic vector-borne diseases caused by protozoan parasites of the genus Leishmania that affect millions of people around the globe. There are various clinical manifestations, ranging from self-healing cutaneous lesions to potentially fatal visceral leishmaniasis, all of which are associated with different Leishmania species. Transmission of these parasites is complex due to the varying ecological relationships between human and/or animal reservoir hosts, parasites, and sand fly vectors. Moreover, vector-borne diseases like leishmaniases are intricately linked to environmental changes and socioeconomic risk factors, advocating the importance of the One Health approach to control these diseases. The development of an accurate, fast, and cost-effective diagnostic tool for leishmaniases is a priority, and the implementation of various control measures such as animal sentinel surveillance systems is needed to better detect, prevent, and respond to the (re-)emergence of leishmaniases. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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26 pages, 4754 KiB

Open AccessEditor’s ChoiceReview

Mosquito-Borne Diseases Emergence/Resurgence and How to Effectively Control It Biologically

by Handi Dahmana and Oleg Mediannikov

Pathogens 2020, 9(4), 310; https://doi.org/10.3390/pathogens9040310 - 23 Apr 2020

Cited by 100 | Viewed by 18390

Abstract

Deadly pathogens and parasites are transmitted by vectors and the mosquito is considered the most threatening vector in public health, transmitting these pathogens to humans and animals. We are currently witnessing the emergence/resurgence in new regions/populations of the most important mosquito-borne diseases, such [...] Read more.

Deadly pathogens and parasites are transmitted by vectors and the mosquito is considered the most threatening vector in public health, transmitting these pathogens to humans and animals. We are currently witnessing the emergence/resurgence in new regions/populations of the most important mosquito-borne diseases, such as arboviruses and malaria. This resurgence may be the consequence of numerous complex parameters, but the major cause remains the mismanagement of insecticide use and the emergence of resistance. Biological control programmes have rendered promising results but several highly effective techniques, such as genetic manipulation, remain insufficiently considered as a control mechanism. Currently, new strategies based on attractive toxic sugar baits and new agents, such as Wolbachia and Asaia, are being intensively studied for potential use as alternatives to chemicals. Research into new insecticides, Insect Growth Regulators, and repellent compounds is pressing, and the improvement of biological strategies may provide key solutions to prevent outbreaks, decrease the danger to at-risk populations, and mitigate resistance. Full article

(This article belongs to the Special Issue Translational Research for Zoonotic Parasites: New Findings toward Improved Diagnostics, Therapy and Prevention)

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