Parasitology最新文献_第5页

The most virulent parasite determines virulence in coinfection: a meta-analysis. 最毒的寄生虫决定合并感染的毒力：一项荟萃分析。

IF 2.4 3区医学

Parasitology Pub Date : 2026-02-11 DOI: 10.1017/S003118202610170X

Charlotte Rafaluk, Victoria L Pike, Mathias Franz, Kayla C King

{"title":"The most virulent parasite determines virulence in coinfection: a meta-analysis.","authors":"Charlotte Rafaluk, Victoria L Pike, Mathias Franz, Kayla C King","doi":"10.1017/S003118202610170X","DOIUrl":"10.1017/S003118202610170X","url":null,"abstract":"Coinfections of hosts by multiple parasite species and strains are widespread in nature. Theory suggests that these infections have a key influence on the virulence, or harm caused, to hosts. However, it is still unclear whether multiple parasites, which may compete for resources and space, are indeed worse for hosts across the tree of life. To test this hypothesis, we conducted separate meta-analyses based on different expectations derived from virulence in single infections. We included 68 effect sizes from 19 experiments on non-human animal host species and 38 parasite species combinations. We found that coinfections are overall more virulent than the mean degree of harm caused by both parasites in retrospective single infections. That said, the coinfection virulence level is similar to that of the most virulent parasite, and less than the additive virulence of both single infections. These results suggest that the most virulent parasite is the primary driver of virulence in coinfection. This finding has implications for parasite spread in nature and suggests we focus on controlling the more harmful parasites in the first instance, when trying to limit the damage caused by coinfection.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-9"},"PeriodicalIF":2.4,"publicationDate":"2026-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146157963","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

Retrospective screening reveals the rare occurrence of zoonotic Strongyloides stercoralis in dogs from temperate Australia, 2014-2024. 回顾性筛查显示2014-2024年澳大利亚温带地区犬类人畜共患粪类圆线虫罕见。

IF 2.4 3区医学

Parasitology Pub Date : 2026-02-09 DOI: 10.1017/S0031182026101693

Jaisy Chong, Jan Šlapeta, Maira Nascimento Meggiolaro, Jennifer Green, Rogan Lee, Michael P Ward, Nicolle Kirkwood

{"title":"Retrospective screening reveals the rare occurrence of zoonotic Strongyloides stercoralis in dogs from temperate Australia, 2014-2024.","authors":"Jaisy Chong, Jan Šlapeta, Maira Nascimento Meggiolaro, Jennifer Green, Rogan Lee, Michael P Ward, Nicolle Kirkwood","doi":"10.1017/S0031182026101693","DOIUrl":"10.1017/S0031182026101693","url":null,"abstract":"Strongyloides stercoralis is an intestinal nematode capable of infecting humans and dogs. Occurrence in dogs from temperate, traditionally non-endemic regions remains poorly characterized, often due to the absence of accessible veterinary diagnostic tests. Recent reports of infections from temperate metropolitan areas have raised concerns about the extent of S. stercoralis prevalence in dogs in these regions. This study investigated the presence of S. stercoralis DNA in canine faecal samples from Sydney, New South Wales, Australia, using a real-time quantitative PCR (qPCR) targeting the 18S rRNA gene, with a limit of detection of 2 DNA copies. Archived faecal DNA (n = 448) collected between 2014 and 2024 from 2 university veterinary hospitals were screened. Of all samples, 1 (0.02%) was positive for S. stercoralis DNA, corresponding to approximately 6.8 × 103 18S rDNA copies, equivalent to 3.2 of S. ratti third-stage larvae, per 250 mg of dog faeces. Partial cox1 and 18S rDNA loci (HVR-I and HVR-IV) deep amplicon sequencing confirmed that S. stercoralis circulates between dogs and humans. The positive sample originated from a Border Collie puppy presenting with gastrointestinal signs. Although detection was rare, this confirms the parasite's presence in companion dogs within a temperate urban environment. The results highlight the diagnostic utility of 18S rDNA-based qPCR for retrospective surveillance and support the inclusion of S. stercoralis in molecular diagnostic panels for dogs with gastrointestinal disease. Expanded, targeted molecular and coproscopic surveillance is warranted to clarify the prevalence, distribution and zoonotic potential of S. stercoralis in dogs across Australia's non-endemic regions.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-9"},"PeriodicalIF":2.4,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146143243","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

Epidemiological survey of Dirofilaria immitis and its Wolbachia endosymbiont in wild raccoon dogs in Seoul, Korea, with emphasis on lung tissue-based detection. 韩国首尔地区野生貉中免疫丝虫及其沃尔巴克氏体内共生体的流行病学调查，重点是肺组织检测。

IF 2.4 3区医学

Parasitology Pub Date : 2026-02-06 DOI: 10.1017/S0031182026101620

Jisook Ryu, Hyunho Lee, Hyun-Kyung Lee, Kyoungsuk Kang, Chang-Seek Ro, Jang-Hee Han, Young Deok Suh, So Eun Ryu, Won Gi Yoo, Seong Chan Yeon

{"title":"Epidemiological survey of Dirofilaria immitis and its Wolbachia endosymbiont in wild raccoon dogs in Seoul, Korea, with emphasis on lung tissue-based detection.","authors":"Jisook Ryu, Hyunho Lee, Hyun-Kyung Lee, Kyoungsuk Kang, Chang-Seek Ro, Jang-Hee Han, Young Deok Suh, So Eun Ryu, Won Gi Yoo, Seong Chan Yeon","doi":"10.1017/S0031182026101620","DOIUrl":"https://doi.org/10.1017/S0031182026101620","url":null,"abstract":"In the ecologically diverse metropolitan area of Seoul, raccoon dogs (Nyctereutes procyonoides) coexist with humans and domestic animals, creating opportunities for vector-borne parasite transmission. Climate-driven shifts in mosquito populations may further enhance these risks, highlighting the need to monitor Dirofilaria immitis in urban wildlife for veterinary and public health. Among 51 raccoon dogs examined, D. immitis was identified in the pulmonary arteries and right ventricle of 13 animals (25.5%) by necropsy, with worm burdens ranging from 2 to 9. Lung tissue PCR revealed 4 additional subclinical infections, resulting in a final confirmed prevalence of 17 positives (33.3%). In contrast, whole-blood PCR detected only 11 positives (21.6%), all confirmed by necropsy, indicating higher sensitivity of lung tissue PCR. Phylogenetic analysis of cytochrome c oxidase subunit 1 sequences showed all isolates clustered with reference D. immitis across Asia and Europe, and haplotype analysis revealed low genetic diversity among Korean isolates. Wolbachia 16S ribosomal RNA sequences from raccoon dogs consistently grouped in supergroup C, confirming their association with D. immitis. These findings confirm natural infections of D. immitis and Wolbachia in wild raccoon dogs and highlight their potential role as urban wildlife reservoirs, while lung tissue-based molecular detection offers synergistic advantages for detecting subclinical infections and improving estimates of heartworm occurrence.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-8"},"PeriodicalIF":2.4,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146126147","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

Taxonomy of Strongyloides in humans, dogs and cats: a comprehensive review from morphology to molecular and population genetics. 人类、狗和猫的类圆线虫分类：从形态学到分子和群体遗传学的综合综述。

IF 2.4 3区医学

Parasitology Pub Date : 2026-02-06 DOI: 10.1017/S003118202610167X

Huan Zhao, Constantin Constantinoiu, Richard Stewart Bradbury

{"title":"Taxonomy of Strongyloides in humans, dogs and cats: a comprehensive review from morphology to molecular and population genetics.","authors":"Huan Zhao, Constantin Constantinoiu, Richard Stewart Bradbury","doi":"10.1017/S003118202610167X","DOIUrl":"10.1017/S003118202610167X","url":null,"abstract":"The genus Strongyloides (Nematoda; Strongyloididae) comprises over 50 species of nematodes parasitic in terrestrial vertebrates, including humans (Homo sapiens), dogs (Canis lupus familiaris) and cats (Felis catus). Taxonomy of the genus has been shaped by over a century of morphological research, with the most widely adopted framework established in the late 1980s. Advances in molecular genetics have increasingly revealed cryptic diversity and yielded new insights into interspecific and intraspecific relationships within the genus. Despite the rapid expansion of molecular genetic data over the past decade, particularly for Strongyloides spp. infecting humans and companion animals, a synthesis of these findings remains lacking. Here, we review historical and contemporary literature on the taxonomy of Strongyloides spp. infecting humans (Strongyloides stercoralis, Strongyloides fuelleborni), dogs (S. stercoralis, including host-specific lineages and cryptic taxa) and cats (Strongyloides felis, Strongyloides planiceps, Strongyloides tumefaciens and S. stercoralis). We provide an updated overview of taxonomic histories, host ranges and key morphological features for genus identification and species differentiation, along with a synthesis of available molecular taxonomic data informed by phylogenetic and population genetic studies. This work is intended to serve as a renewed reference for researchers, diagnosticians and clinicians working with Strongyloides spp. in medical and veterinary contexts, supporting accurate diagnosis and guiding future taxonomic research on these nematodes.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-26"},"PeriodicalIF":2.4,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146126111","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

Spirometra infections in humans in Asia and Oceania. 亚洲和大洋洲人类的肺metra感染。

IF 2.4 3区医学

Parasitology Pub Date : 2026-02-04 DOI: 10.1017/S0031182026101644

Hiroshi Yamasaki, Pewpan Maleewong Intapan, Wanchai Maleewong

{"title":"Spirometra infections in humans in Asia and Oceania.","authors":"Hiroshi Yamasaki, Pewpan Maleewong Intapan, Wanchai Maleewong","doi":"10.1017/S0031182026101644","DOIUrl":"10.1017/S0031182026101644","url":null,"abstract":"The genus Spirometra (Cestoda: Diphyllobothriidae) is a group of tapeworms distributed worldwide and includes important species that cause sparganosis and spirometrosis in humans. Traditionally, it has been accepted that non-proliferative sparganosis is caused by Spirometra erinaceieuropaei and proliferative sparganosis by Sparganum proliferum. However, recent molecular studies have revealed that the species present in Asia are Spirometra mansoni and the recently described Spirometra asiana, not S. erinaceieuropaei endemic to Europe. It is questionable whether Spa. proliferum is a valid species: proliferative sparganosis cases in Asia might be caused by S. mansoni. Some human cases of multiple infections with plerocercoids of non-proliferative species may have been mistaken for proliferative sparganosis. This review focuses on sparganosis and spirometrosis in Asia and Oceania and overviews the molecular phylogeny, geographic distribution, current situation, innovative diagnostic methods and future perspectives for work on these species. Whether the species referred to as Spa. proliferum in Asia and Spa. proliferum in South America are conspecific is also discussed. Concerning S. asiana, little is known about its biology, biogeography and pathogenicity in humans. Accurate identification of these etiological agents through DNA analysis is important for the reliable assessment of zoonotic relevance and further understanding of the biology and epidemiology of these tapeworms.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-18"},"PeriodicalIF":2.4,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146113713","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

Exploring the diversity of Brazilian camallanids: a checklist of the family Camallanidae (Nematoda) from Brazil with a new key to identification of the genera in the family. 探索巴西camallanids的多样性：巴西Camallanidae （Nematoda）的清单和鉴定该科属的新钥匙。

IF 2.4 3区医学

Parasitology Pub Date : 2026-02-02 DOI: 10.1017/S0031182026101668

Leandro Mauricio Oliveira Silva, Ana Nunes Santos, Luiz Felipe Ferreira Trindade, Francisco Tiago Vasconcelos Melo

{"title":"Exploring the diversity of Brazilian camallanids: a checklist of the family Camallanidae (Nematoda) from Brazil with a new key to identification of the genera in the family.","authors":"Leandro Mauricio Oliveira Silva, Ana Nunes Santos, Luiz Felipe Ferreira Trindade, Francisco Tiago Vasconcelos Melo","doi":"10.1017/S0031182026101668","DOIUrl":"10.1017/S0031182026101668","url":null,"abstract":"The family Camallanidae includes nematodes traditionally classified based on the morphology of their buccal capsules. However, several questions have been raised about the validity of these characteristics for their classification. Despite having a remarkable diversity, our knowledge of camallanids in Brazil remains limited, leaving gaps in our understanding of the true species diversity in the country, their geographical distribution and host species associations. Therefore, this study presents a checklist of species in the family Camallanidae recorded in Brazil, including a review for the classificationa and new dichotomous key for identifying the genera. Camallanidae comprises 2 subfamilies with 13 valid genera, classified based on the morphology of the buccal capsule and trident, and on the presence, shape and distribution of internal ridges on the capsule. Thirty-seven species, distributed across 7 genera, have been recorded in Brazil so far, parasitizing 276 host taxa, including fish, chelonians and snakes, with no records of these nematodes parasitizing amphibians in the country. We reallocated five species of Spirocamallanus and 2 species of Procamallanus to Denticamallanus, and 1 species of Camallanus was reallocated to Serpinema. Spirocamallanus is the most diverse genus, with 16 species, and Spirocamallanus inopinatus exhibited the highest host taxa association diversity (144) and the widest geographical distribution. Until further molecular studies are conducted, the new dichotomous key presented in this checklist contributes to a better understanding of the classification of the family Camallanidae, based on the morphology of the buccal capsule and accessory structures.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-36"},"PeriodicalIF":2.4,"publicationDate":"2026-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146100437","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

Manipulating vector transmission reveals local processes in Bartonella communities of bats. 操纵媒介传播揭示了蝙蝠巴尔通体群落的局部过程。

IF 2.4 3区医学

Parasitology Pub Date : 2026-02-02 DOI: 10.1017/S0031182026101656

Clifton D McKee, Colleen T Webb, Michael Y Kosoy, Richard Suu-Ire, Yaa Ntiamoa-Baidu, Andrew A Cunningham, James L N Wood, David T S Hayman

{"title":"Manipulating vector transmission reveals local processes in Bartonella communities of bats.","authors":"Clifton D McKee, Colleen T Webb, Michael Y Kosoy, Richard Suu-Ire, Yaa Ntiamoa-Baidu, Andrew A Cunningham, James L N Wood, David T S Hayman","doi":"10.1017/S0031182026101656","DOIUrl":"10.1017/S0031182026101656","url":null,"abstract":"Infectious diseases result from multiple interactions among microbes and hosts, but community ecology approaches are rarely applied. Manipulation of vector populations provides a unique opportunity to test the importance of vectors in infection cycles while also observing changes in pathogen community diversity and species interactions. Yet for many vector-borne infections in wildlife, a biological vector has not been experimentally verified, and few manipulative studies have been performed. Using a captive colony of fruit bats in Ghana, we conducted the first study to experimentally test the role of bat flies as vectors of Bartonella species. We observed changes in the Bartonella bacteria community over time following the decline of bat flies and again after their subsequent restocking. Reduced transmission rates led to microbial community changes attributed to ecological drift and potential species sorting through interspecific competition mediated by host immunity. We demonstrate that forces maintaining diversity in communities of free-living macroorganisms act in similar ways in communities of symbiotic microorganisms, both within and among hosts.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-12"},"PeriodicalIF":2.4,"publicationDate":"2026-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146100430","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

Drivers of Perkinsus marinus and Haplosporidium nelsoni prevalence and intensity in oyster reefs around Sapelo Island, Georgia. 萨佩洛岛牡蛎礁中滨海波金索菌和尼尔森单孢子虫流行及强度的驱动因素

IF 2.4 3区医学

Parasitology Pub Date : 2026-02-01 DOI: 10.1017/S0031182025101431

Wil Atencio, Shelby Ziegler, Stephen Greiman, John Carroll

{"title":"Drivers of Perkinsus marinus and Haplosporidium nelsoni prevalence and intensity in oyster reefs around Sapelo Island, Georgia.","authors":"Wil Atencio, Shelby Ziegler, Stephen Greiman, John Carroll","doi":"10.1017/S0031182025101431","DOIUrl":"10.1017/S0031182025101431","url":null,"abstract":"Parasites can strongly influence host populations, particularly when the host is an ecosystem engineer. Oysters are ecosystem engineers that support estuarine communities and fisheries but are susceptible to 2 protozoan parasites, Perkinsus marinus (causing Dermo) and Haplosporidium nelsoni (causing MSX). Although both parasites are known to be influenced by environmental conditions, fine-scale temporal and spatial patterns remain underexplored in southeastern US estuaries. We examined parasite prevalence and intensity biweekly from April to October 2023 across 4 intertidal reefs on Sapelo Island, Georgia, and analysed concurrent water quality data (temperature, salinity, dissolved oxygen, pH) to identify potential environmental drivers of parasite prevalence and intensity. Parasite prevalence was high overall, 88% of oysters were infected with at least 1 parasite, and 34% were co-infected. Haplosporidium nelsoni prevalence was consistently high across sites, while P. marinus prevalence showed greater spatiotemporal variability, increasing through late summer and fall. Models indicated a time-lagged effect of environmental conditions on P. marinus prevalence, specifically with temperature and dissolved oxygen. Prevalence of H. nelsoni remained high throughout the year among sites and was best explained by temperature variability, salinity, and dissolved oxygen. Intensity levels did not differ among sites for either parasite. Our results demonstrate that even at small spatial scales and over time, oyster-parasite dynamics are shaped by multiple, interacting environmental factors, with time-lagged responses particularly evident for P. marinus. Understanding these dynamics is essential for predicting disease impacts under changing environmental conditions and informing management, restoration, and aquaculture strategies.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"186-197"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145782369","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 obligate ectoparasites and parasitism patterns in wild birds of the Balearic Islands: new chewing lice records for Spain. 巴利阿里群岛野生鸟类专性外寄生虫的多样性和寄生模式：西班牙咀嚼虱的新记录。

IF 2.4 3区医学

Parasitology Pub Date : 2026-02-01 DOI: 10.1017/S0031182025101194

Rafael Gutiérrez López, Mikel Alexander González, Julia López-Mercadal, Raul Escandell, Oscar García-Febrero, Rafel Triay, E Coll, Miriam García, Ivan Bernal, Carlos Talabante, María L Moraza, Miguel Angel Miranda, Carlos Barceló

{"title":"Diversity of obligate ectoparasites and parasitism patterns in wild birds of the Balearic Islands: new chewing lice records for Spain.","authors":"Rafael Gutiérrez López, Mikel Alexander González, Julia López-Mercadal, Raul Escandell, Oscar García-Febrero, Rafel Triay, E Coll, Miriam García, Ivan Bernal, Carlos Talabante, María L Moraza, Miguel Angel Miranda, Carlos Barceló","doi":"10.1017/S0031182025101194","DOIUrl":"10.1017/S0031182025101194","url":null,"abstract":"Ectoparasites are commonly found on wild birds and might play an important role as vectors of pathogens. The Balearic Islands archipelago (Spain) is an ecological hotspot for wild birds due to its geographical location and habitat diversity. Although the avian fauna of the archipelago is well studied, little information is available regarding the ectoparasites infesting its wild bird populations. This study aimed to identify the diversity of ectoparasites (chewing lice, louse flies and ticks) and feather mites on wild birds in several locations on Menorca Island, as well as to assess the prevalence based on the migration status and season. Our research revealed that ten of the 13 species of chewing lice collected in this study are reported here for the first time in the Balearic Islands, including two that are also new records for Spain. We did not find statistically significant differences in the prevalence of ectoparasites or feather mites between sedentary and migratory birds. Likewise, no significant differences were observed in feather mite prevalence among migratory birds from Illa de s'Aire between prenuptial and postnuptial migrations. This study provides valuable insights into the prevalence and diversity of ectoparasites, shedding light on their potential role as vectors for avian pathogens. Further research is needed to explore the pathogens these ectoparasites may carry and transmit, contributing to a better understanding of the epidemiology of avian diseases in Menorca.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"148-158"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145605607","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

Differential detection of Ascaridia galli and Heterakis gallinarum eggs in intestinal and caecal excreta of floor-housed laying hens: a longitudinal study. 地板饲养蛋鸡肠道和盲肠排泄物中鸡蛔虫和鸡异虫蛋的鉴别检测：一项纵向研究。

IF 2.4 3区医学

Parasitology Pub Date : 2026-02-01 DOI: 10.1017/S0031182025101534

Teka Feyera, Brendan Sharpe, Isabelle Ruhnke, Stephen W Walkden-Brown

{"title":"Differential detection of Ascaridia galli and Heterakis gallinarum eggs in intestinal and caecal excreta of floor-housed laying hens: a longitudinal study.","authors":"Teka Feyera, Brendan Sharpe, Isabelle Ruhnke, Stephen W Walkden-Brown","doi":"10.1017/S0031182025101534","DOIUrl":"10.1017/S0031182025101534","url":null,"abstract":"Ascaridia galli and Heterakis gallinarum, the most prevalent nematodes of chickens, inhabit the small intestine and caeca, respectively, and often co-occur. Current excreta egg count (EEC) methods do not differentiate between their eggs, and although chickens produce two distinct excreta types - intestinal excreta (IE) and caecal excreta (CE) - the distribution of eggs of these species across them remains poorly understood. Forty Hy-Line Brown laying hens (40 weeks, mean body weight (BW) 2·07 ± 0·02 kg), cleared of prior nematode infection and artificially infected with A. galli (n = 20) or H. gallinarum (n = 20) were housed in separate floor pens and monitored for 26 weeks. Assessments included clinical signs, EECs from IE, CE and mixed excreta (ME), and worm recovery from subsets of birds at 8, 14, 20 and 26 weeks. Neither infection resulted in clinical signs, but A. galli slightly reduced BW gain (0·5 g/week/hen) than H. gallinarum (2·8 g/week/hen). Egg detection aligned with worm predilection sites: A. galli eggs were predominantly found in IE, while H. gallinarum eggs were largely confined to CE. In ME samples, egg counts were reduced by 45% relative to IE for A. galli and 60% relative to CE for H. gallinarum. EECs showed a negative but non-significant association with excreta moisture content. Natural re-infection produced a stable adult worm population in both infections. These findings demonstrate that analysing IE and CE separately provides a practical, non-lethal approach for differentiating these infections, while ME appears to have limited diagnostic utility. Further studies should evaluate these patterns across broader conditions and individual variation.","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"255-265"},"PeriodicalIF":2.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145912496","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