Parasitology最新文献

Do specialist haemoparasites induce tolerance in their hosts?

IF 2.1 3区医学

Parasitology Pub Date : 2025-03-26 DOI: 10.1017/S0031182025000393

Cameron Armour, Abigail L Hone, Jenny C Dunn

引用次数: 0

Characterization and MicroRNA Quantification of Plasma-derived Extracellular Vesicles in Patients with Plasmodium knowlesi infection.

IF 2.1 3区医学

Parasitology Pub Date : 2025-03-26 DOI: 10.1017/S0031182025000423

Thunchanok Khammanee, Natakorn Nokchan, Piyatida Molika, Hansuk Buncherd, Kanitta Srinoun, Natta Tansila, Charinrat Saechan, Rachanida Praparatana, Nongyao Sawangjaroen, Suwannee Jitueakul, Chatree Ratcha, Churat Weeraphan, Jisnuson Svasti, Raphatphorn Navakanitworakul, Supinya Thanapongpichat

引用次数: 0

Beyond morphology: cryptic diversity in nine new Gyrodactylus species (Monogenea: Gyrodactylidae) associated with northwest African barbels (Cyprinidae) and remarks on Gyrodactylus nyingiae Shigoley, Rahmouni, Louizi, Pariselle and Vanhove, 2023.

IF 2.1 3区医学

Parasitology Pub Date : 2025-03-26 DOI: 10.1017/S0031182025000411

Chahrazed Rahmouni, Mária Seifertová, Andrea Šimková

引用次数: 0

To bin or not to bin: why parasite abundance data should not be lumped into categories for statistical analysis.

IF 2.1 3区医学

Parasitology Pub Date : 2025-03-24 DOI: 10.1017/S003118202500040X

Robert Poulin

{"title":"To bin or not to bin: why parasite abundance data should not be lumped into categories for statistical analysis.","authors":"Robert Poulin","doi":"10.1017/S003118202500040X","DOIUrl":"https://doi.org/10.1017/S003118202500040X","url":null,"abstract":"The impact of macroparasites on their hosts is proportional to the number of parasites per host, or parasite abundance. Abundance values are count data, i.e. integers ranging from 0 to some maximum number, depending on the host-parasite system. When using parasite abundance as a predictor in statistical analysis, a common approach is to bin values, i.e. group hosts into infection categories based on abundance, and test for differences in some response variable (e.g. a host trait) among these categories. There are well-documented pitfalls associated with this approach. Here, I use a literature review to show that binning abundance values for analysis has been used in one-third of studies published in parasitological journals over the past 15 years, and half of the studies in ecological and behavioural journals, often without any justification. Binning abundance data into arbitrary categories has been much more common among studies using experimental infections than among those using naturally infected hosts. I then use simulated data to demonstrate that true and significant relationships between parasite abundance and host traits can be missed when abundance values are binned for analysis, and vice versa that when there is no underlying relationship between abundance and host traits, analysis of binned data can create a spurious one. This holds regardless of the prevalence of infection or the level of parasite aggregation in a host sample. These findings argue strongly for the practice of binning abundance data as a predictor variable to be abandoned in favour of more appropriate analytical approaches.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-8"},"PeriodicalIF":2.1,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143693101","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

Interactions between the autochthonous deer ked Lipoptena cervi and the alien L. fortisetosa (Diptera: Hippoboscidae) ectoparasites of Cervus elaphus in Italy: coexistence or competition?

IF 2.1 3区医学

Parasitology Pub Date : 2025-03-17 DOI: 10.1017/S0031182025000198

Laura Stancampiano, Annalisa Andreani, Federica Usai, Patrizia Sacchetti, Maria P Ponzetta

{"title":"Interactions between the autochthonous deer ked Lipoptena cervi and the alien L. fortisetosa (Diptera: Hippoboscidae) ectoparasites of Cervus elaphus in Italy: coexistence or competition?","authors":"Laura Stancampiano, Annalisa Andreani, Federica Usai, Patrizia Sacchetti, Maria P Ponzetta","doi":"10.1017/S0031182025000198","DOIUrl":"https://doi.org/10.1017/S0031182025000198","url":null,"abstract":"The autochthonous Lipoptena cervi and the allochthonous Lipoptena fortisetosa in Cervus elaphus in Central/Northern Italy were studied during autumn and winter 2018-2020 in order to evaluate the possible interactions between the two parasite species and the possible influence of geographical parameters on their abundance. This survey could help disentangling whether the coexistence between the two species will be possible or the competitive exclusion of L. cervi is to be expected. The results show that L. cervi is influenced by host sex and age and is more abundant at higher altitudes, while L. fortisetosa is more abundant in lower altitudes and in southern/eastern areas. The interaction between the two species is evident and symmetrical but mild at the component community level, while at the infracommunity level an asymmetric competition has been evidenced by the displacement of L. cervi when L. fortisetosa is present in the same body location. Geographical clusters of L. fortisetosa are evident in plains near urbanized areas, while L. cervi distribution appeared more scattered in all the Apennine ridge. Our observations indicate that the two deer ked species not only can coinfect the same host population but also the same host individual, avoiding strong direct interaction and competitive exclusion. All the observed patterns reflect different adaptations to environmental conditions and possible strategies to minimize competition. However, longitudinal surveys are needed to evaluate if the observed pattern is a constant feature or a result of the sampling seasons.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143649980","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

Application of molecular detection, phylogenetic analysis, and risk factor evaluation for combating Anaplasma infection in small-scale livestock farms in Thailand.

IF 2.1 3区医学

Parasitology Pub Date : 2025-03-05 DOI: 10.1017/S0031182025000277

Wissanuwat Chimnoi, Pairpailin Jhaiaun, Jumnongjit Phasuk, Domechai Kaewnoi, Tawin Inpankaew, Burin Nimsuphan, Ruttayaporn Ngasaman, Ketsarin Kamyingkird

{"title":"Application of molecular detection, phylogenetic analysis, and risk factor evaluation for combating Anaplasma infection in small-scale livestock farms in Thailand.","authors":"Wissanuwat Chimnoi, Pairpailin Jhaiaun, Jumnongjit Phasuk, Domechai Kaewnoi, Tawin Inpankaew, Burin Nimsuphan, Ruttayaporn Ngasaman, Ketsarin Kamyingkird","doi":"10.1017/S0031182025000277","DOIUrl":"10.1017/S0031182025000277","url":null,"abstract":"Anaplasmosis is a significant tick-borne disease (TBDs) caused by Anaplasma that affecting ruminant health and production worldwide. This study aimed to identify Anaplasma spp. infection using molecular as a fast diagnostic tool, perform a phylogenetic analysis and evaluate associated risk factors for combating Anaplasma spp. infection in small-scale livestock farms in Thailand. Total 963 blood samples from ruminants were collected from 125 farms across 4 regions of Thailand. Molecular diagnosis of Anaplasma spp. targeted the msp4 gene using conventional polymerase chain reaction (PCR) was performed and reported to the farmers within 14 days. Positive PCR products were purified, sequenced, and analysed the phylogenetic. Associated risk factor evaluations were conducted using R software. The overall prevalence of Anaplasma spp. infection in ruminants was 26.90%. The highest prevalence was observed in bullfighting cattle (47.06%), followed by beef cattle (35.75%), dairy cattle (21.73%), and goats (6.67%), with no infection in buffalo. Regionally, the Northern region had the highest prevalence (49.01%), followed by the Southern (25.88%), Central (22.01%), and Northeastern (13.81%) regions. Anaplasma spp. was commonly detected in Phrae, Chiang Rai, and Tak provinces. Sequencing confirmed A. marginale 99.64% to 99.76% identity to sequences in GenBank. Risk factors associated with A. marginale infection were history of TBDs on farm, animal illnesses, responsible person for treatment, and improper faeces removal practices. This study revealed a moderate to high Anaplasma infection across four regions. These findings underscore the need for enhanced tick control measures on farms, should be strictly implemented and promoted to reduce disease prevalence.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143557658","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 extinction of a parasite of Magellanic penguins? The effect of a warming hotspot on a 'cold' trematode.

IF 2.1 3区医学

Parasitology Pub Date : 2025-02-27 DOI: 10.1017/S0031182025000216

Paula Marcotegui, Matias Merlo, Manuel Marcial Irigoitia, María Paz Gutiérrez, Claudio Buratti, Juan Pablo, Seco Pon, Manuela Parietti, Juan Tomás Timi

{"title":"Local extinction of a parasite of Magellanic penguins? The effect of a warming hotspot on a 'cold' trematode.","authors":"Paula Marcotegui, Matias Merlo, Manuel Marcial Irigoitia, María Paz Gutiérrez, Claudio Buratti, Juan Pablo, Seco Pon, Manuela Parietti, Juan Tomás Timi","doi":"10.1017/S0031182025000216","DOIUrl":"10.1017/S0031182025000216","url":null,"abstract":"It is often postulated that natural systems are expected to suffer an increasing risk of infectious disease outbreaks as climate change accelerates. In the northern Argentine Sea, the rise of ocean temperature has produced a tropicalization of demersal megafauna since 2013. This rapidly warming hotspot provides an excellent model to test whether fish parasites have increased, declined, or remained stable in the region. Cardiocephaloides physalis a parasite of penguins Spheniscus magellanicus as adult and suspected to parasitize anchovies Engraulis anchoita as larvae is here used to compare their occurrence and abundance between samples composed by 1752 fish of variable age caught at different latitudes during 1993-1995 and 2022 and between 20 juvenile birds and literature data. In the present work, the identity of metacercariae as C. physalis is confirmed genetically, as well as a net decline of population parameters of the parasite to its effective disappearance in anchovies from northern areas and to extremely low levels in fish from southern regions and penguins. After analysing possible causes for such changes in a scenario of rapid regional tropicalization, a direct effect of increasing temperature on parasites arose as the main causal candidate for the observed decline in their populations over the last decades. Beyond the biological and ecological consequences of global change on them, parasites offer excellent systems for measuring and monitoring such effects. The almost local extinction of C. physalis in a marine hotspot of global warming seems to be one of the first examples of such processes.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143516283","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

Carry-over non-consumptive effects: impact of parasite exposure during larval stage on adult phenotype.

IF 2.1 3区医学

Parasitology Pub Date : 2025-02-24 DOI: 10.1017/S0031182025000265

Caroline Liang, Lien T Luong

{"title":"Carry-over non-consumptive effects: impact of parasite exposure during larval stage on adult phenotype.","authors":"Caroline Liang, Lien T Luong","doi":"10.1017/S0031182025000265","DOIUrl":"10.1017/S0031182025000265","url":null,"abstract":"The presence of parasites can elicit host responses even in the absence of infection. These risk-induced trait responses include altered host behaviours, morphology, and/or physiology, which can trade off with other fitness-related traits. Studies of predator-induced non-consumptive effects (NCEs) have demonstrated that exposure at one life stage can lead to NCEs in the next stage, but no studies to date have examined such an effect of parasite exposure. Numerous NCEs have been demonstrated in larval, pupal and adult stages of Drosophila nigrospiracula exposed to ectoparasitic mites (Macrocheles subbadius). Here we experimentally investigated whether parasite-induced NCEs carry over into subsequent developmental stages (i.e. interstadial effects). We tested the prediction that when flies are exposed to mites during the larval and pupal stages, the subsequent adult stage will exhibit decreased body mass, fecundity and longevity. However, we did not detect downstream effects of parasite exposure on adult body mass, fecundity or longevity. The probability of survival and lifetime fecundity were comparable for previously exposed and unexposed groups. We suggest that when parasite exposure is confined to one developmental stage, and the risk of infection is removed in the subsequent stage, the long-term effects of parasite exposure dissipate. The potential to recover from the interim costs of parasite exposure may provide an added benefit to host dispersal.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143483798","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

Blastocystis and Cryptosporidium in association with biofilms in a contaminated watercourse.

IF 2.1 3区医学

Parasitology Pub Date : 2025-02-24 DOI: 10.1017/S0031182025000253

Virginia Estrada, Melisa Leone, Alicia Saura, Marisa Farber, Ludmila López-Arias

{"title":"Blastocystis and Cryptosporidium in association with biofilms in a contaminated watercourse.","authors":"Virginia Estrada, Melisa Leone, Alicia Saura, Marisa Farber, Ludmila López-Arias","doi":"10.1017/S0031182025000253","DOIUrl":"10.1017/S0031182025000253","url":null,"abstract":"The objective of this study was to assess the potential role of aquatic biofilms as natural reservoirs for Blastocystis. For this purpose, surface water (n = 4) and biofilm samples (n = 8) were collected from a stream nearby an urban area characterized by limited sanitation infrastructure and a high prevalence of Blastocystis in humans. Blastocystis cysts were detected in three of the four water samples and seven of the eight biofilm samples using fluorescence microscopy. Furthermore, viable cysts were identified exclusively in biofilm samples (five of the eight), while no live cysts were detected in water samples. These findings indicate that aquatic biofilms provide a habitat where Blastocystis cysts can adhere and remain viable, potentially contributing to their environmental accumulation. In addition, molecular characterization of the five isolates identified subtypes ST8 (allele 21) and ST3 (allele 36). This study is the first to report the detection and identification of viable Blastocystis subtypes in aquatic biofilms. The analysis of biofilms by fluorescence microscopy, as demonstrated here, offers a promising approach for monitoring Blastocystis and could serve as an alternative to traditional water sampling methods.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143483795","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

Description of four cases of male genital schistosomiasis (MGS) in children and adolescents, with a scoping review. 描述四例儿童和青少年男性生殖器血吸虫病（MGS）病例，并进行范围界定审查。

IF 2.1 3区医学

Parasitology Pub Date : 2025-02-24 DOI: 10.1017/S0031182025000241

Joachim Richter, Sekeleghe A Kayuni, J Russell Stothard, Charles Émile Ramarokoto, Andreas K Lindner, Daniela Fusco, Hermann Feldmeier, Amaya L Bustinduy, Jennifer F Friedman

{"title":"Description of four cases of male genital schistosomiasis (MGS) in children and adolescents, with a scoping review.","authors":"Joachim Richter, Sekeleghe A Kayuni, J Russell Stothard, Charles Émile Ramarokoto, Andreas K Lindner, Daniela Fusco, Hermann Feldmeier, Amaya L Bustinduy, Jennifer F Friedman","doi":"10.1017/S0031182025000241","DOIUrl":"10.1017/S0031182025000241","url":null,"abstract":"We present four cases of male genital schistosomiasis (MGS) within children and adolescents opportunistically encountered as part of a wider screening programme for imported schistosomiasis in Germany and community outreach screening in Mali. Such genital manifestations in young children and adolescents are often overlooked but can include hydrocele, hypogonadism, varicocele, cutaneous granulomata on the penis and scrotum, echogenic spots in the prostate and the epididymis, alongside testicular masses. Though these cases appear sporadic, from our scoping literature review, they draw fresh attention on MGS in young children and highlight wider confusion with other congenital, neoplastic and infectious disease. These might include an insufficient closure of the tunica vaginalis, malignancies or lymphatic filariasis. Frequently haematuria is not present. One typical sign indicating MGS in adults, i.e. haematospermia is not present before puberty. Another reason of missing MGS cases may be that screening with scrotal or transabdominal ultrasonography are not easily accepted unless the reason for it is not extensively explained beforehand and that transabdominal ultrasonography is less sensitive for revealing prostatic lesions than transrectal ultrasonography.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-10"},"PeriodicalIF":2.1,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143483805","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