Journal of Helminthology最新文献_第7页

Morphological and molecular characterisations of Helicotylenchus laichauensis sp. n. associated with Lai Chau ginseng (Panax vietnamensis var. fuscidiscus) from Vietnam. 越南来州人参（Panax viet ensis var. fuscidiscus）的形态学和分子特征。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-07-28 DOI: 10.1017/S0022149X26101928

T D Nguyen, T M L Le, K L Phan, P Q Trinh

{"title":"Morphological and molecular characterisations of Helicotylenchus laichauensis sp. n. associated with Lai Chau ginseng (Panax vietnamensis var. fuscidiscus) from Vietnam.","authors":"T D Nguyen, T M L Le, K L Phan, P Q Trinh","doi":"10.1017/S0022149X26101928","DOIUrl":"10.1017/S0022149X26101928","url":null,"abstract":"A new spiral nematode species, Helicotylenchus laichauensis sp. n., is described from the rhizosphere of Panax vietnamensis var. fuscidiscus in northern Vietnam. The new species is characterised by a hemispherical lip region with 4-5 annuli, a lateral field with four incisures whose inner lines fuse distally into a distinct m-shaped pattern on the tail, and a well-developed stylet 24.5-26.7 μm long, with knobs flattened to slightly indented anteriorly and a conus forming 50.1-53.5% of the total stylet length. The spermatheca is round and filled with sperm, and males are common. The tail is conical, dorsally convex, tapering to a prominent ventral projection bearing a variable mucro; phasmids are located 3-7 annuli anterior to the anus. Based particularly on similarities in the lip region structure, stylet morphology, lateral field pattern, phasmid position, and tail configuration, the H. laichauensis sp. n. is close to the known species namely H. microcephalus, H. craigi, H. oleae, and H. amplius. Phylogenetic analyses based on the D2-D3 expansion segments of 28S, partial 18S, and ITS rRNA sequences revealed that the newly generated sequences of the new species form a maximally supported clade with corresponding sequences of Helicotylenchus microcephalus in all constructed trees.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e82"},"PeriodicalIF":2.0,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148604162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In utero egg counts in female Haemonchus contortus from experimentally infected lambs: implications for fertility estimates. 来自实验感染羔羊的雌性扭曲血蜱的子宫内卵数：对生育估计的影响。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-07-17 DOI: 10.1017/S0022149X26101850

T A Kuzmina, Y Syrota, M Komáromyová, M Babják, A Königová, Z Váradyová, M Várady

{"title":"In utero egg counts in female Haemonchus contortus from experimentally infected lambs: implications for fertility estimates.","authors":"T A Kuzmina, Y Syrota, M Komáromyová, M Babják, A Königová, Z Váradyová, M Várady","doi":"10.1017/S0022149X26101850","DOIUrl":"10.1017/S0022149X26101850","url":null,"abstract":"Haemonchus contortus is a highly pathogenic gastrointestinal nematode of domestic and wild ruminants whose epidemiological success is closely linked to high reproductive capacity. For female daily egg output, however, direct observations remain limited, and published estimates vary widely, ranging from fewer than 20 to 10,000-15,000 eggs per female per day. This study assessed in utero egg counts in female H. contortus recovered from experimentally infected lambs in order to evaluate their implications for fertility relative to values commonly cited in the literature. Archived female nematodes from a previously published experiment were used to conduct the study. In total, 147 female worms recovered from 14 sheep were examined. It was found that the average in utero egg count was 345 (SD = 145) eggs per H. contortus female. Regression analysis provided no clear evidence that the experimental design substantially influenced this parameter. In addition, female body length was positively associated with egg counts, though the relationship was not strictly linear. Overall, the present study supports moderate rather than high estimates of female daily egg output for H. contortus.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e80"},"PeriodicalIF":2.0,"publicationDate":"2026-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148471116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Genetic evidence for the microphallid trematode Maritrema gratiosum in the Northeast Pacific and an overview of its global distribution. 东北太平洋微小吸虫的遗传证据及其全球分布概况。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-07-13 DOI: 10.1017/S0022149X26101771

Kevin C K Ma, Colin D MacLeod, Carly Janusson, Jiou-An Ho, Matthew A Lemay, Alyssa-Lois M Gehman, Christopher D G Harley

{"title":"Genetic evidence for the microphallid trematode Maritrema gratiosum in the Northeast Pacific and an overview of its global distribution.","authors":"Kevin C K Ma, Colin D MacLeod, Carly Janusson, Jiou-An Ho, Matthew A Lemay, Alyssa-Lois M Gehman, Christopher D G Harley","doi":"10.1017/S0022149X26101771","DOIUrl":"https://doi.org/10.1017/S0022149X26101771","url":null,"abstract":"The trematode Maritrema gratiosum Nicoll, 1907 has a heteroxenous life cycle comprising a marine gastropod as its first intermediate host, a barnacle as its second intermediate host, and a bird as its definitive host. Globally, the species is widely distributed from subtropical waters of the South China Sea to arctic waters of the Barents Sea. In European waters (namely, western Europe and the Barents Sea), the complete life cycle of M. gratiosum is known. Elsewhere in its range, however, its life cycle remains incompletely understood. Clarifying its distribution and resolving unknown host associations are essential for advancing a more holistic view of host-parasite dynamics and their ecological role in intertidal ecosystems. In this study, M. gratiosum was detected using DNA-based assays in individuals of the barnacle Balanus glandula Darwin, 1854 that were collected from the rocky intertidal zone along the southern coast of British Columbia, Canada. This finding provides the first molecular evidence of this trematode species in the Pacific, complementing earlier records. The same molecular approach can be extended to identify region-specific hosts, such as the first intermediate (molluscan) host in the Pacific region, which remains unidentified.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e79"},"PeriodicalIF":2.0,"publicationDate":"2026-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148430549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New insights into the life cycle of Gnathostoma turgidum Stossich, 1902 (Nematoda: Gnathostomatidae). 对大齿口线虫（Gnathostoma turgidum Stossich）生命周期的新认识，1902（线虫目：齿口线虫科）。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-07-10 DOI: 10.1017/S0022149X26101795

M Á Mosqueda-Cabrera, E Sánchez-Miranda, L D Castillo-Loeza, J Carbajal-Reyes, L García-Prieto, G Torres-Carrera

{"title":"New insights into the life cycle of Gnathostoma turgidum Stossich, 1902 (Nematoda: Gnathostomatidae).","authors":"M Á Mosqueda-Cabrera, E Sánchez-Miranda, L D Castillo-Loeza, J Carbajal-Reyes, L García-Prieto, G Torres-Carrera","doi":"10.1017/S0022149X26101795","DOIUrl":"https://doi.org/10.1017/S0022149X26101795","url":null,"abstract":"In this work, the life cycle of Gnathostoma turgidum was studied both in natural temporary water bodies and under experimental conditions, with materials collected from the municipality of San Francisco Ixhuatán, Oaxaca. Adult nematodes inhabit the interstitial layers of the stomach in the definitive host (Didelphis virginiana) and release their eggs into the environment via faeces, typically in a dry environment. Under these conditions, the eggs remain quiescent until the onset of the rainy season. Development of early third-stage larvae occurs in cyclopoid copepods. Fry acts as transport and/or intermediate hosts, while frogs (Lithobates forreri) serve as obligatory intermediate hosts for advanced third-stage larvae, ultimately transmitting the parasites to the definitive host. Notably, the precocity phenomenon, typical of larval development in intermediate hosts, occurs in this species within the definitive host. Precocity is likely a response to host behaviour or other ecological factors that restrict transmission to narrow spatial and temporal windows. Adults die at the end of the rainy season. The marked seasonality of this species is mainly attributed to the combination of two factors: (i) the seasonal predation of frogs by the definitive host, and (ii) expulsion of adult stages as immune-mediated 'self-cure'. This study represents the first documentation of birds acting as paratenic hosts for this nematode.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e78"},"PeriodicalIF":2.0,"publicationDate":"2026-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148421506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatiotemporal trends in Schistocephalus solidus infection among populations of Alaskan threespine stickleback (Gasterosteus aculeatus). 阿拉斯加三棘棘鱼群体中固头血吸虫感染的时空趋势。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-07-08 DOI: 10.1017/S0022149X26101734

A M Wohlleben, N P Meyer, N C Steinel

{"title":"Spatiotemporal trends in Schistocephalus solidus infection among populations of Alaskan threespine stickleback (Gasterosteus aculeatus).","authors":"A M Wohlleben, N P Meyer, N C Steinel","doi":"10.1017/S0022149X26101734","DOIUrl":"10.1017/S0022149X26101734","url":null,"abstract":"Understanding the dynamics of host-parasite interactions is essential for uncovering the ecological and evolutionary processes shaping natural populations. In this study, we investigated the spatial and temporal patterns of prevalence of the cestode Schistocephalus solidus in 4 Alaskan populations of threespine stickleback (Gasterosteus aculeatus) over 11 years (1996 to 2006). Additionally, we assessed host tolerance through key indicators such as the Parasite Index and the presence of fibrotic scar tissue, a specialized form of resistance in this system. We observed fibrosis formation in both infected and uninfected fish across all populations, with notable year-to-year variability in Cornelius Lake. Here, fibrosis prevalence ranged from 9% in 1997 to 63% in 1998, coinciding with the highest cestode prevalence recorded in this population. Willow Lake stickleback displayed persistently high Parasite Indices, with parasite weights occasionally exceeding host eviscerated weights, and experienced a potential epizootic from 2000 to 2005. Cestode prevalence remained stable in Rocky and Cornelius Lakes and was consistently low in Lazy Lake. Our findings demonstrate significant variation in cestode prevalence, parasite burden, and resistance mechanisms among populations and between years. Importantly, the decoupling of fibrosis formation from infection status highlights the multifaceted nature of host-parasite interactions. Our study emphasizes the value of long-term datasets in revealing spatial and temporal patterns in host-parasite dynamics. Future research integrating ecological and genetic frameworks will be critical for elucidating the drivers of resistance and tolerance and their evolutionary implications.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e77"},"PeriodicalIF":2.0,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148404680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Short communication: Excretory-secretory antigens allow effective IgG detection in experimental Strongyloides hyperinfection under immunosuppression. 短通讯：在免疫抑制的实验性圆线虫过度感染中，排泄-分泌抗原允许有效的IgG检测。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-07-02 DOI: 10.1017/S0022149X26101692

E F G de Carvalho, J E N de Souza, V da S Ribeiro, J M Costa-Cruz, H T Gonzaga

引用次数: 0

Gastric nematode co-infections and redescription of Neoterranova serrata in Arapaima gigas from Central Amazon. 亚马逊河中部巨噬巨噬鱼胃线虫共感染及锯齿状新terranova serrata的重新描述。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-06-29 DOI: 10.1017/S0022149X26101758

D F Conga, F Batalha da Silva, M Enoki Caracciolo, G Corrêa de Oliveira, W L A Pereira, M de Abreu Elias, L Maranhão

{"title":"Gastric nematode co-infections and redescription of Neoterranova serrata in Arapaima gigas from Central Amazon.","authors":"D F Conga, F Batalha da Silva, M Enoki Caracciolo, G Corrêa de Oliveira, W L A Pereira, M de Abreu Elias, L Maranhão","doi":"10.1017/S0022149X26101758","DOIUrl":"https://doi.org/10.1017/S0022149X26101758","url":null,"abstract":"In the Amazon region, Arapaima gigas holds significant gastronomic and cultural value compared to other fish species due to its large size. This fish is home to various helminth species that parasitise primarily its gastrointestinal organs. During the 2023 dry season, a total of 60 gastrointestinal organs from A. gigas specimens were collected from a fisheries management program conducted by local residents within the Mamirauá Reserve. For gastric parasitological analysis, each organ was separated in containers, and the parasites were recovered, washed, and fixed in 70% alcohol for analysis by light and scanning electron microscopy. Additionally, stomach samples of the hosts infected with parasites were fixed in 10% formalin for histopathological examination. 16% of the parasitised fish presented ulcerative areas in the gastric mucosa of varying degrees. Microscopically, a severe inflammatory reaction with infiltration of eosinophils, lymphocytes, and macrophages was observed, associated with co-infection by Goezia spinulosa and Neoterranova serrata. Additionally, morphological and morphometric data aided by scanning electron microscopy for N. serrata were added.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e75"},"PeriodicalIF":2.0,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148345382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In vitro anthelmintic activity and mode of action of Pleurotus djamor basidiomes and mycelium extracts and fractions against Haemonchus contortus eggs. 侧耳担子及菌丝体提取物及组分对弯血螨卵的体外驱虫活性及作用方式。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-06-29 DOI: 10.1017/S0022149X26101783

A G Cauich-Olan, K A Zapata-Escalante, J A Pineda-Alegría, C G Marin-Tun, J F D J Torres-Acosta, C A Sandoval-Castro, L Aguilar-Marcelino, M G Mancilla-Montelongo

{"title":"In vitro anthelmintic activity and mode of action of Pleurotus djamor basidiomes and mycelium extracts and fractions against Haemonchus contortus eggs.","authors":"A G Cauich-Olan, K A Zapata-Escalante, J A Pineda-Alegría, C G Marin-Tun, J F D J Torres-Acosta, C A Sandoval-Castro, L Aguilar-Marcelino, M G Mancilla-Montelongo","doi":"10.1017/S0022149X26101783","DOIUrl":"https://doi.org/10.1017/S0022149X26101783","url":null,"abstract":"This study evaluated the in vitro activity and mode of action of ethanolic extracts (Et) and respective different polarity fractions (hexane, ethyl acetate (EA), butanol, aqueous) from basidiomes and mycelium of Pleurotus djamor against Haemonchus contortus eggs, using the egg hatching test. After incubation (concentration gradient from 20 to 3600 μg/mL), emerged larvae and eggs were observed and counted, differentiating between morulated eggs (ME) and larvated eggs (LE). Effective concentrations required to inhibit 50% or 90% (EC50; EC90) of hatching, and their respective 95% confidence intervals (95% CIs) were determined. Extracts and fractions obtained from basidiomes exhibited lower EC50 (P < 0.05) than those obtained from the mycelium, except for the hexane basidiome fraction, which showed less activity compared to the mycelium fraction. Both butanol fractions presented similar EC50 (~140 μg/mL). Polar mycelium materials exhibited a higher proportion of LE, while the hexane fraction demonstrated an ovicidal effect (abundant ME), and the EA fraction was inactive. The low EC50 of extracts and fractions of basidiomes and mycelium confirmed that P. djamor is a promising non-conventional anthelmintic that should be evaluated under in vivo conditions with small ruminants. The EC50 values were better than most tropical plant materials reported to date.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e73"},"PeriodicalIF":2.0,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148345397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ollulanus tricuspis in Turkish cats: first clinical case and molecular confirmation. 土耳其猫的三尖疣：第一例临床病例和分子证实。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-06-29 DOI: 10.1017/S0022149X2610176X

Tuğçe Tuygun, Mehmet Öztürk, Rübeyda Dinç, Cenk Soner Bölükbaş, Ali Tümay Gürler, Şinasi Umur

引用次数: 0

Anthelmintic resistance of gastrointestinal nematodes in cattle herds in mid-mountain central France. 法国中部中部山区牛群胃肠线虫的抗虫性。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-06-26 DOI: 10.1017/S0022149X26101746

L Dravigney, C Chartier, P Grelaud, T Jozan, L Ledieu, M Lopez, J Höglund, N Ravinet

{"title":"Anthelmintic resistance of gastrointestinal nematodes in cattle herds in mid-mountain central France.","authors":"L Dravigney, C Chartier, P Grelaud, T Jozan, L Ledieu, M Lopez, J Höglund, N Ravinet","doi":"10.1017/S0022149X26101746","DOIUrl":"10.1017/S0022149X26101746","url":null,"abstract":"Anthelmintic resistance (AR) in gastrointestinal nematodes is insufficiently studied in cattle in many European regions, including France, where only three studies have been conducted in the north-west. This study evaluated the efficacy of benzimidazoles and avermectins in cattle from a mid-mountain region in central France. Faecal egg count reduction tests (FECRT) were performed in 22 groups of 10-25 calves from 16 dairy or beef farms. Each group received either oral oxfendazole (OFZ, 11 groups) or injectable ivermectin (IVM, 11 groups). Faecal samples were collected in a paired study design before (D0) and after treatment (D10-14 for OFZ, D14-17 for IVM). Individual faecal egg counts (FECs) were determined using the Mini-FLOTAC method, and pooled faecal samples were cultured per group to determine the proportions of Ostertagia and Cooperia larvae using droplet digital PCR. Efficacy classification (resistant, susceptible or inconclusive) was determined for each group according to the WAAVP guidelines, using the fecrt.com web application and the clinical protocol scenario with a grey zone of 90-99%. IVM resistance was detected on 10 of 11 farms, with 33-49% and 51-67% of larvae being Ostertagia and Cooperia after treatment, respectively. The remaining farm had inconclusive results. OFZ resistance was detected on 2 of 11 farms, with 100% and 97% of larvae being Ostertagia after treatment. The remaining 9 farms were classified as susceptible. This study provides valuable local insights into AR, which could help raise awareness among farmers and veterinarians and encourage changes in treatment practices.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e72"},"PeriodicalIF":2.0,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148330551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0