Parasitology最新文献_第3页

Unveiling the evolutionary pathways of Ochoterenella: a new species discovery and its phylogenetic implications. 揭示奥氏菌的进化途径：一个新物种的发现及其系统发育意义。

IF 2.1 3区医学

Parasitology Pub Date : 2025-07-03 DOI: 10.1017/S0031182025100462

Gabriel Lima Rebêlo, Jorge Kevin Silva Neves, Fred Gabriel Haick, Ronald Ferreira Jesus, Karina Varella, Luiz Felipe Ferreira Trindade, Leticia de Aguiar da Costa, Fabrícia de Jesus Paiva da Fonseca Sizo, Arnaldo Maldonado Júnior, Carlos Eduardo Costa-Campos, Francisco Tiago Vasconcelos Melo

{"title":"Unveiling the evolutionary pathways of Ochoterenella: a new species discovery and its phylogenetic implications.","authors":"Gabriel Lima Rebêlo, Jorge Kevin Silva Neves, Fred Gabriel Haick, Ronald Ferreira Jesus, Karina Varella, Luiz Felipe Ferreira Trindade, Leticia de Aguiar da Costa, Fabrícia de Jesus Paiva da Fonseca Sizo, Arnaldo Maldonado Júnior, Carlos Eduardo Costa-Campos, Francisco Tiago Vasconcelos Melo","doi":"10.1017/S0031182025100462","DOIUrl":"10.1017/S0031182025100462","url":null,"abstract":"Ochoterenella is a large group of filarial parasites of anurans distributed throughout Central and South America. In the present study, we describe a new species of Ochoterenella parasitizing 2 frogs, Boana geographica and Boana multifasciata, from different localities in the Brazilian Amazon. The main morphological traits that differ Ochoterenella casiraghii n. sp. from its congeners are the smaller body size, a shorter cephalic plate, smaller parastomal structures, and the small, short and rounded cuticular bosses on the body of both sexes. The females have a shorter ovejector, and the number of caudal papillae distinguishes males. Pairwise sequence comparisons of the new species reveal a high level of divergence from Ochoterenella spp. Our phylogenetic analyses, based on cox1 and concatenated partial mitochondrial genes, support the monophyly of all subfamilies and genera examined herein. The new species represents the 17th in the Ochoterenella genus and a new parasite record for both anuran species. We provide the first ultrastructural description of the species in the genus and establish the phylogenetic relationships of the new species among parasites of amphibians and reptiles from the Onchocercidae.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-20"},"PeriodicalIF":2.1,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144560759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prevalence and diversity of Acanthocephala in stream-dwelling amphipods (Gammarus fossarum) around an urban area in the eastern Alpine foothills. 东阿尔卑斯山麓城市地区河栖片足类（Gammarus fossarum）棘头类的流行和多样性。

IF 2.1 3区医学

Parasitology Pub Date : 2025-07-03 DOI: 10.1017/S0031182025100449

Fabian Gallhammer, Jacqueline Grimm, Susanne Reier, Kristina M Sefc

{"title":"Prevalence and diversity of Acanthocephala in stream-dwelling amphipods (Gammarus fossarum) around an urban area in the eastern Alpine foothills.","authors":"Fabian Gallhammer, Jacqueline Grimm, Susanne Reier, Kristina M Sefc","doi":"10.1017/S0031182025100449","DOIUrl":"10.1017/S0031182025100449","url":null,"abstract":"Population dynamics of aquatic parasites respond to factors like host availability, habitat age and quality. Amphipods are intermediate hosts for Acanthocephala, a widespread group of parasitic worms. Acanthocephalan infections of amphipods can easily be detected, and the widespread occurrence of amphipods makes their infection status an attractive potential proxy for the ecological status of their aquatic environment, including stressors introduced by urbanization. This study investigated the prevalence and the species-level and genetic diversity of Acanthocephala in the stream amphipod Gammarus fossarum. The study streams cross forested, agricultural and urban landscapes in the eastern foothills of the European Alps. Parasite prevalence ranged from 0% to 8.8% and increased towards downstream reaches independent of surrounding land use. Oxford Nanopore Technology was used to sequence the mitochondrial cytochrome oxidase I barcoding locus to identify parasite species and assess their genetic diversity. The majority of the parasites were Pomphorhynchus tereticollis, which use fish as definitive hosts. Despite their relative abundance in the studied streams, their genetic diversity was low and the most common haplotype was found at all sampling sites, which might indicate population expansion. Amphipods also hosted P. laevis and Polymorphus sp. type 1, the first evidence of this cryptic species within Polymorphus cf. minutus in Austria. Genetic diversity was high in Polymorphus sp. type 1, possibly reflecting a large effective population size due to gene flow maintained by the avian final hosts. The low and downstream-biased prevalence suggests that definitive hosts may be a limiting factor for Acanthocephala populations in small streams.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-11"},"PeriodicalIF":2.1,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144554106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diversity of Stomylotrema spp. in the Mexican tropical lowlands: the case of Stomylotrema bijugum and Stomylotrema vicarium (Digenea: Stomylotrematidae), parasites of aquatic and passerine birds. 墨西哥热带低地Stomylotrema的多样性：bijugum Stomylotrema和vicarium Stomylotrema （digenia: Stomylotrema dae）的案例，水生和雀形鸟寄生虫。

IF 2.1 3区医学

Parasitology Pub Date : 2025-07-03 DOI: 10.1017/S0031182025100413

Marcelo Tonatiuh González-García, Valerie Pérez-Mancilla, César A Ríos-Muñoz, Ana Lucia Sereno-Uribe, Martín García-Varela, Mirza P Ortega-Olivares

{"title":"Diversity of Stomylotrema spp. in the Mexican tropical lowlands: the case of Stomylotrema bijugum and Stomylotrema vicarium (Digenea: Stomylotrematidae), parasites of aquatic and passerine birds.","authors":"Marcelo Tonatiuh González-García, Valerie Pérez-Mancilla, César A Ríos-Muñoz, Ana Lucia Sereno-Uribe, Martín García-Varela, Mirza P Ortega-Olivares","doi":"10.1017/S0031182025100413","DOIUrl":"10.1017/S0031182025100413","url":null,"abstract":"Distinguishing between Stomylotrema bijugum and S. vicarium is challenging due to their phenotypic plasticity. In this study, adult specimens were recovered from 9 host species in the Mexican tropical lowlands. To explore the morphological differences, 32 morphological characteristics were evaluated in 54 specimens. Linear discriminant analysis provided enough evidence to differentiate the 2 species. Additionally, a principal component analysis (PCA) was performed for each species. The PCA of S. bijugum revealed 3 groups separately corresponding to specimens from the 3 hosts, suggesting host-induced phenotypic plasticity, whereas the PCA of S. vicarium revealed that the specimens from 3 host species were clustered together, indicating morphometric homogeneity. To confirm the morphological differences between the 2 species of Stomylotrema, we sequenced 2 molecular markers: the D1-D3 domains of the large subunit (LSU) from nuclear DNA and nicotinamide adenine dinucleotide dehydrogenase subunit 1 (Nad1) from mitochondrial DNA. Sequences of the LSU were aligned and compared with the LSU sequences of other congeneric species available in GenBank. Phylogenetic analyses supported the monophyly of Stomylotrema, with 2 main subclades that corresponded to S. bijugum and S. vicarium. A haplotype network was predicted with 25 Nad1 sequences, revealing the presence of 2 clusters representing the 2 species separated from each other by 98 substitutions. The current studies on S. bijugum and S. vicarium revealed new hosts and geographical regions in the Americas, suggesting that both species addressed in the current study can complete their life cycle in the Neotropical region of Mexico.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-16"},"PeriodicalIF":2.1,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144554104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Local and global density have distinct and parasite-dependent effects on infection in wild sheep. 本地和全球密度对野生羊的感染具有明显的寄生虫依赖效应。

IF 2.1 3区医学

Parasitology Pub Date : 2025-07-01 DOI: 10.1017/S0031182025100383

Gregory F Albery, Amy R Sweeny, Yolanda Corripio-Miyar, Mike J Evans, Adam D Hayward, Josephine M Pemberton, Jill G Pilkington, Daniel H Nussey

{"title":"Local and global density have distinct and parasite-dependent effects on infection in wild sheep.","authors":"Gregory F Albery, Amy R Sweeny, Yolanda Corripio-Miyar, Mike J Evans, Adam D Hayward, Josephine M Pemberton, Jill G Pilkington, Daniel H Nussey","doi":"10.1017/S0031182025100383","DOIUrl":"10.1017/S0031182025100383","url":null,"abstract":"High density should drive greater parasite exposure. However, evidence linking density with infection generally uses density proxies or measures of population size, rather than measures of individuals per space within a continuous population. We used a long-term study of wild sheep to link within-population spatiotemporal variation in host density with individual parasite counts. Although four parasites exhibited strong positive relationships with local density, these relationships were mostly restricted to juveniles and faded in adults. Furthermore, one ectoparasite showed strong negative relationships across all age classes. In contrast, population size - a measure of global density - had limited explanatory power, and its effects did not remove those of spatial density, but were distinct. These results indicate that local and global density can exhibit diverse and contrasting effects on infection within populations. Spatial measures of within-population local density may provide substantial additional insight to temporal metrics based on population size, and investigating them more widely could be revealing.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144529162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of the complete mitochondrial genome of Longicollum pagrosomi yamaguti, 1935 (Palaeacanthocephala: Echinorhynchida) in cultured large yellow croaker (Larimichthys crocea) and its phylogenetic implications. 养殖大黄鱼（Larimichthys crocea） Longicollum pagrosomi Yamaguti, 1935（古棘头目：棘头目）线粒体全基因组的特征及其系统发育意义。

IF 2.1 3区医学

Parasitology Pub Date : 2025-07-01 DOI: 10.1017/S003118202510036X

Zhongjie Ren, Xiaoao Yang, Lihua Jiang, Denghui Zhu, Zhen Tao, Yanjie Wang, Peipei Fu, Rui Song

引用次数: 0

New genetic variants of Toxoplasma gondii isolates and a novel ROP5 allele in free-range chickens from Tabasco, México. 墨西哥塔巴斯科市散养鸡刚地弓形虫分离株的新遗传变异和新的ROP5等位基因。

IF 2.1 3区医学

Parasitology Pub Date : 2025-07-01 DOI: 10.1017/S0031182025100401

Luis Fernando Valenzuela-Moreno, Carlos Cedillo-Peláez, Claudia Patricia Rico-Torres, Lluvia Guadalupe Moreno-Pérez, Claudia Virginia Zaragoza-Vera, Luz Belinda Ortiz-Alegría, Irma Cañedo-Solares, Lizbeth Xicoténcatl-García, Fernando García-Lacy, Heriberto Caballero-Ortega

引用次数: 0

Geographic variation in the determinants of ectoparasite faunas' species richness: fleas and gamasid mites parasitic on small mammals from 6 biogeographic realms. 外寄生动物群物种丰富度决定因素的地理差异：蚤和革螨寄生于6个生物地理领域的小型兽类。

IF 2.1 3区医学

Parasitology Pub Date : 2025-06-27 DOI: 10.1017/S0031182025100371

Boris R Krasnov, Vasily I Grabovsky, Natalia Korallo-Vinarskaya, Maxim V Vinarski, Angel Luis Robles Fernandez, Irina Khokhlova

{"title":"Geographic variation in the determinants of ectoparasite faunas' species richness: fleas and gamasid mites parasitic on small mammals from 6 biogeographic realms.","authors":"Boris R Krasnov, Vasily I Grabovsky, Natalia Korallo-Vinarskaya, Maxim V Vinarski, Angel Luis Robles Fernandez, Irina Khokhlova","doi":"10.1017/S0031182025100371","DOIUrl":"https://doi.org/10.1017/S0031182025100371","url":null,"abstract":"We investigated the effects of body mass, geographic range size, the within-range richness of host assemblages (diversity field) and the habitat breadth of small mammalian hosts from 6 biogeographic realms on the species richness of their flea and gamasid mite faunas. We also tested whether the probability of between-host ectoparasite sharing is related to host phylogenetic relatedness, trait similarity or geographic distance/environmental dissimilarity between their ranges. We asked whether the effects of host-associated determinants of ectoparasite richness and the probability of ectoparasite sharing differ between (1) biogeographic realms and (2) fleas and mites. Whenever significant effects of host body mass on ectoparasite richness were found, they were negative, whereas the significant effects of geographic range size, diversity field and habitat breadth were positive. The occurrence of each determinant's effects on ectoparasite species richness differed (1) within fleas or mites between realms and (2) between fleas and mites within a realm. In all realms, the probability of a flea or a mite species being shared between hosts decreased with a decrease in the hosts' phylogenetic relatedness, trait similarity, geographic distance between ranges or environmental similarity. The probabilities of an ectoparasite species being shared between hosts were most strongly related to the hosts' trait similarity and were least related to the environmental similarity. We conclude that caution is needed in making judgements about the generality of macroecological patterns related to parasites based on the investigations of these patterns in limited numbers of localities and when pooling data on various taxa.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-12"},"PeriodicalIF":2.1,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144507515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Chemotactic behavior of Giardia lamblia and Trichomonas vaginalis toward nutrient sources. 贾第鞭毛虫和阴道毛滴虫对营养源的趋化行为。

IF 2.1 3区医学

Parasitology Pub Date : 2025-06-25 DOI: 10.1017/S0031182025000484

Aparna Sudhakar, Abritty Kisku, Shreya Rao, Pratima Jhanwar, Utpal Tatu

引用次数: 0

Closing the diagnostic gap in male genital schistosomiasis (MGS): current detection tools and novel strategies. 缩小男性生殖器血吸虫病的诊断差距：当前的检测工具和新策略。

IF 2.1 3区医学

Parasitology Pub Date : 2025-06-24 DOI: 10.1017/S0031182025000599

Bronwyn Neufeld, Sergio España-Cueto, Lisette van Lieshout, Bonnie L Webster, Pytsje T Hoekstra, Sekeleghe Kayuni, J Russell Stothard, Tegwen Marlais, Shinjiro Hamano, Amaya L Bustinduy

{"title":"Closing the diagnostic gap in male genital schistosomiasis (MGS): current detection tools and novel strategies.","authors":"Bronwyn Neufeld, Sergio España-Cueto, Lisette van Lieshout, Bonnie L Webster, Pytsje T Hoekstra, Sekeleghe Kayuni, J Russell Stothard, Tegwen Marlais, Shinjiro Hamano, Amaya L Bustinduy","doi":"10.1017/S0031182025000599","DOIUrl":"10.1017/S0031182025000599","url":null,"abstract":"Male genital schistosomiasis (MGS), a gender-specific manifestation of urogenital schistosomiasis and neglected tropical disease, typically results from the entrapment of Schistosoma haematobium eggs within the male genital tract. Across the world, there are no current and accurate estimates of the burden of MGS, due to disease underreporting primarily from diagnostic challenges and a lack of general awareness within the health system. Diagnostic methods for MGS are extremely limited. Conventionally, semen microscopy for Schistosoma ova is used though this technique suffers from low sensitivity and lacks protocol standardization. The introduction of molecular diagnostics, such as polymerase chain reaction (PCR), has partly helped overcome this challenge of low sensitivity, though may not be suitable for use in resource-constrained settings. To address these challenges, in this review, we propose a two-step diagnostic algorithm for MGS in accordance with recent WHO guidelines, consisting of a high sensitivity serological test followed by a high specificity test (microscopy or molecular assay, dependent on setting). Further investigation is required into standardization of sample collection, processing, storage, and analysis in order to identify an evidence-based optimal diagnostic pipeline. New diagnostic tools are needed such as isothermal molecular assays, alongside optimization for semen analysis, which may alleviate barriers to diagnosis and present opportunities for integration with other sexual and reproductive health screening. These areas of future investigation underpin the development of a suitable diagnostic pipeline, as the continued neglect of MGS and its underdiagnosis presents a threat to the goal of elimination of schistosomiasis as a public health problem.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-10"},"PeriodicalIF":2.1,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144476286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Toxoplasma gondii seroprevalence, seroconversion rates and genetic variability in humans from Uruguay. 乌拉圭人类刚地弓形虫血清阳性率、血清转化率和遗传变异。

IF 2.1 3区医学

Parasitology Pub Date : 2025-06-23 DOI: 10.1017/S0031182025100334

Alejandra Valentin-Decuadro, Leandro Ramiro Tana-Hernandez, Paula Faral-Tello, Pablo Fresia, Mariana Guirado, Marianella Rodriguez Rey, Gonzalo Diaz, Valentina Gimenez, Gabriela Greising, Nora Fernandez, Juan Pablo Gesuele, Maria E Francia

{"title":"Toxoplasma gondii seroprevalence, seroconversion rates and genetic variability in humans from Uruguay.","authors":"Alejandra Valentin-Decuadro, Leandro Ramiro Tana-Hernandez, Paula Faral-Tello, Pablo Fresia, Mariana Guirado, Marianella Rodriguez Rey, Gonzalo Diaz, Valentina Gimenez, Gabriela Greising, Nora Fernandez, Juan Pablo Gesuele, Maria E Francia","doi":"10.1017/S0031182025100334","DOIUrl":"10.1017/S0031182025100334","url":null,"abstract":"Toxoplasmosis, caused by the obligate intracellular parasite Toxoplasma gondii, is one of the most prevalent zoonotic parasitic infections worldwide. When acquired during pregnancy, T. gondii can be transmitted to the fetus, with clinical outcomes influenced by gestational age at time of infection and the parasite's genotype. Prenatal screening enables the detection of maternal seroconversion and offers a critical window for intervention. In Uruguay, despite mandatory serological screening during pregnancy, national data on T. gondii seroprevalence and maternal seroconversion have not been updated in two decades. In addition, the genetic diversity of local strains remains poorly characterized. In this study, we analysed publicly available serological data from pregnant individuals attending Uruguay's largest public maternity hospital between 2019 and 2023. We found that seroprevalence has modestly declined from 50% (reported in 1998) to 45.5%, with a congenital transmission rate of 0.58%. Clinical analysis of affected newborns revealed chorioretinitis as the predominant manifestation. To investigate parasite diversity, we performed genotyping of T. gondii strains using in silico PCR-RFLP following molecular detection. Our findings revealed substantial genetic diversity, including novel allele combinations not previously described in the region. These results highlight both the continued public health burden and the evolving genetic landscape of T. gondii in Uruguay. Our findings underscore the need to strengthen surveillance and prevention strategies for congenital toxoplasmosis in South America.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-11"},"PeriodicalIF":2.1,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144369132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0