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Journal of Helminthology

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https://www.readbyqxmd.com/read/28069083/pcr-primers-for-straightforward-differentiation-of-haemonchus-contortus-haemonchus-placei-and-their-hybrids
#1
M R V Amarante, M C Santos, C C Bassetto, A F T Amarante
Haemonchus contortus and Haemonchus placei are among the major parasites of small ruminants and cattle. Although infection with these nematodes is host-specific, with H. placei predominating in cattle and H. contortus in sheep, cross-infections are observed in areas where both parasites are sympatric, and hybrid offspring can occur. Therefore, a fast and precise method is required for differentiating the parasites. Identification based on spicule morphometry is the most common technique for differentiating Haemonchus species...
January 10, 2017: Journal of Helminthology
https://www.readbyqxmd.com/read/28069081/influence-of-triaenophorus-nodulosus-plerocercoids-cestoda-pseudophyllidea-on-the-occurrence-of-intestinal-helminths-in-the-perch-perca-fluviatilis
#2
N J Morley, J W Lewis
Concurrent infections of helminths in vertebrates are widespread and may demonstrate synergistic, antagonistic or negligible levels of interactions between species that share a common site. However, indirect interactions between species that occur in different organs of a host are poorly documented, particularly in fish. Plerocercoids of Triaenophorus nodulosus are common liver infections of European perch (Perca fluviatilis). These larval cestodes cause extensive liver damage, resulting in systemic pathologies that include alteration of the physiochemical environment of the intestine...
January 10, 2017: Journal of Helminthology
https://www.readbyqxmd.com/read/27976599/helminth-parasites-of-finfish-commercial-aquaculture-in-latin-america
#3
L C Soler-Jiménez, A I Paredes-Trujillo, V M Vidal-Martínez
Latin America has tripled production by aquaculture up to 78 million tonnes in the past 20 years. However, one of the problems that aquaculture is facing is the presence of helminth parasites and the diseases caused by them in the region. In this review we have collected all the available information on helminths affecting commercial aquaculture in Latin America and the Caribbean (LAC), emphasizing those causing serious economic losses. Monogeneans are by far the most common and aggressive parasites affecting farmed fish in LAC...
December 15, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27905270/gastrointestinal-helminth-fauna-of-rodents-from-cambodia-emphasizing-the-community-ecology-of-host-parasite-associations
#4
K Chaisiri, M Chou, C C Siew, S Morand, A Ribas
Extensive field surveys of rodents were conducted in Cambodia from 2008 to 2014 to study the diversity and ecology of helminth infection in wild rodent populations. Gastrointestinal helminths were isolated from 14 species of rodents (569 individuals) trapped from different habitats (forest, dry land, rain-fed land and human settlements) in four provinces of Cambodia (Krong Preah Sihanouk, Mondolkiri, Pursat and Steung Treng). The average prevalence of parasitic infection was 58.5% (range, 16.0-64.7%), and 19 helminth taxa were identified in total...
December 1, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27905269/climate-influences-assemblages-of-abomasal-nematodes-of-sheep-on-steppe-pastures-in-the-east-of-algeria
#5
I Zouyed, J Cabaret, B Bentounsi
It is a common view that assemblages of parasitic nematodes are influenced by climatic conditions; however, there are only a few articles available regarding those that infect farm animals. We investigated the relationship between climate variables and infection with abomasal trichostrongyles in 335 1-year-old rams grazed on steppe pastures in Eastern Algeria. Abomasa were collected from 12 local slaughterhouses located in four climatic areas (from humid to arid) and the worms extracted, identified and counted...
December 1, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27890039/genetic-diversity-of-infective-larvae-of-gnathostoma-spinigerum-nematoda-gnathostomatidae-in-freshwater-swamp-eels-from-thailand
#6
P Eamsobhana, D Wanachiwanawin, K Roongruangchai, S L Song, H S Yong
Human gnathostomiasis is a food-borne zoonosis caused by a tissue nematode of the genus Gnathostoma. The disease is highly endemic in Asia, including Thailand. The freshwater swamp eel (Monopterus albus), the second intermediate host of the gnathostome nematode, has an important role in transmitting the infection in Thailand. Surveys on the infective larvae of Gnathostoma spinigerum based on morphological features in freshwater swamp eels have been performed continuously and reported in Thailand. However, there is still limited molecular data on intra-species variations of the parasite...
November 28, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27866481/effect-of-inoculum-age-and-physical-parameters-on-in-vitro-culture-of-the-entomopathogenic-nematode-steinernema-feltiae
#7
L G Leite, D I Shapiro-Ilan, S Hazir, M A Jackson
Entomopathogenic nematodes (EPNs) of the families Steinernematidae and Heterorhabditidae have a symbiotic association with bacteria which makes them virulent against insects. EPNs have been mass produced using in vivo and in vitro methods, including both solid and liquid fermentation. This study assessed the effect of nematode inoculum age on the production of Steinernema feltiae in liquid, solid and biphasic processes. Several physical parameters were also assessed: the effect of medium viscosity, flask size and aeration speed on the recovery and yield of infective juveniles (IJs)...
November 21, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27866480/consumption-of-nutritional-pellets-with-duddingtonia-flagrans-fungal-chlamydospores-reduces-infective-nematode-larvae-of-haemonchus-contortus-in-faeces-of-saint-croix-lambs
#8
L Aguilar-Marcelino, P Mendoza-de-Gives, G Torres-Hernández, M E López-Arellano, C M Becerril-Pérez, A Orihuela-Trujillo, J F J Torres-Acosta, A Olmedo-Juárez
Two groups of six Haemonchus contortus infected Saint Croix lambs each received different diets for 11 weeks: control group, commercial food, molasses and lucerne hay; and treated group, nutritional pellets (NPs) containing Duddingtonia flagrans at 2 × 106 chlamydospores/kg body weight (BW), sorghum and lucerne hay. Mean BW gain (BWG), body condition score (BCS) and packed cell volume (PCV) and also eggs/g of faeces (EPG) and recovered L3 were compared using a repeated measures across time model. Groups had similar BWG (control 139...
November 21, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27855726/helminth-parasites-of-south-american-fishes-current-status-and-characterization-as-a-model-for-studies-of-biodiversity
#9
J L Luque, F B Pereira, P V Alves, M E Oliva, J T Timi
The South American subcontinent supports one of the world's most diverse and commercially very important ichthyofauna. In this context, the study of South American fish parasites is of increased relevance in understanding their key roles in ecosystems, regulating the abundance or density of host populations, stabilizing food webs and structuring host communities. It is hard to estimate the number of fish parasites in South America. The number of fish species studied for parasites is still low (less than 10%), although the total number of host-parasite associations (HPAs) found in the present study was 3971...
November 18, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27852341/larval-digenean-preferences-in-two-sympatric-snail-species-at-differing-tidal-levels-off-the-atlantic-coast-of-patagonia
#10
G Di Giorgio, C Gilardoni, E Bagnato, F Cremonte, C Ituarte
Larval stages of the trematodes Maritrema madrynense and Hemiuroidea fam. gen. et sp. differentially parasitized Siphonaria lessonii and S. lateralis, two sympatric pulmonate snail species on the rocky intertidal shore at Puerto Deseado, south-western Atlantic coast of Patagonia, Argentina. Snail specimens were collected at two sampling sites with contrasting physical-chemical characteristics. One site, in the upper intertidal, was exposed to sewage from fish-processing plants, greater hydrodynamic forcing and desiccation, a wider temperature range, longer exposure to ultraviolet radiation and higher abundance of birds...
November 17, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27813468/molecular-identification-of-the-rumen-flukes-paramphistomum-leydeni-and-paramphistomum-cervi-in-a-concurrent-infection-of-the-red-deer-cervus-elaphus
#11
M Sindičić, F Martinković, T Strišković, M Špehar, I Štimac, M Bujanić, D Konjević
Paramphistomosis, caused by paramphistomid flukes, is a gastrointestinal parasitic disease of domestic and wild ruminants. Originally thought to be limited to the tropics and subtropics, the disease has recently been reported in temperate regions. Here we describe the concurrent infection of a red deer doe (Cervus elaphus) with Paramphistomum leydeni and Paramphistomum cervi. This is the first report of P. leydeni in Croatia. Flukes were identified on the basis of morphological keys (tegumental papillae) and sequencing of the internal transcribed spacer region 2 in ribosomal DNA...
November 4, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27809946/parasite-communities-and-infection-levels-of-the-invasive-chinese-sleeper-perccottus-glenii-actinopterygii-odontobutidae-from-the-naab-river-basin-germany
#12
Y Kvach, M Janáč, S Nehring, M Ondračková, P Jurajda
The Chinese sleeper (Perccottus glenii), an invasive Asian fish, was first registered in Germany in 2009 (westernmost extent of its invasive range). We sampled Chinese sleepers from two localities on the Bücherlgraben creek (a tributary of the River Naab) in south-eastern Germany in November 2015 and examined them for parasite infection. Twelve taxa were registered, including ciliates (unidentified Trichodina), a monogenean, three cestode species, two digenean taxa, two acanthocephalan species, two nematode species and one mollusc glochidia...
November 4, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27809941/a-method-for-measuring-the-attachment-strength-of-the-cestode-hymenolepis-diminuta-to-the-rat-intestine
#13
W Xie, G R Racz, B S Terry, S L Gardner
A unique adaptation of many internal parasites of mammals is their ability to stay in the intestine for extended periods of time and resist the normal peristaltic movements and forces that push and expel material. To better understand parasite adhesion behaviour and replicate their attachment method in medical devices, an experiment was designed and performed using the rat tapeworm, Hymenolepis diminuta. The experiment employed a tensile test machine and a digital scale and was designed to calculate the attachment strength of the scolex to the mucosa through the change of the value of the digital scale during the tensile test...
November 4, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27790964/increased-igg-antibody-responses-to-excretory-secretory-antigens-in-neonates-born-from-mothers-infected-with-filarial-nematodes
#14
K G Achary, M S Bal, N N Mandal, A K Satapathy
The present investigation aimed to evaluate the extent to which maternal filarial infection influences IgG subclass immune responses in the cord blood of neonates. Prevalence of antigenaemia was detected using an Og4C3 assay. Filaria-specific IgG subclasses against excretory/secretory antigens were measured by ELISA. Transplacental transfer of circulating filarial antigen (CFA) was observed from 34.8% of CFA-positive mothers to their respective cord bloods. Filaria-specific IgG1, IgG2 and IgG4 responses were significantly higher among cord bloods of infected mothers compared to cord bloods of uninfected mothers...
October 28, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27790963/comparison-between-merthiolate-iodine-formalin-and-kato-katz-methods-for-the-diagnosis-of-human-helminth-infections-in-resource-limited-settings
#15
R N Incani, T Homan, E Pinelli, L Mughini-Gras, H Guevara, J Jesus
Diagnosis of intestinal parasites through examination of fresh faecal samples is hampered by its unpleasantness and the urgent need to detect all parasitic forms. In this paper, we compared the standard Kato-Katz (KK) technique with a traditional fixation method, the merthiolate-iodine-formalin (MIF) method. Two hundred and twenty-seven faecal samples from individuals living in a rural setting in Venezuela with high to moderate prevalences of Ascaris lumbricoides (Al), Trichuris trichiura (Tt) and hookworm infections were examined...
October 28, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27790962/nematode-infection-patterns-in-a-neotropical-lizard-species-from-an-insular-mountain-habitat-in-brazil
#16
A B H P Václav, L A Anjos, M S Queiróz, L B Nascimento, C A B Galdino
Neotropical lizards are known to harbour rich nematode parasite faunas; however, knowledge of the diversity and patterns of infection are still lacking for many species. This is true for the genus Tropidurus, in which data on patterns of parasitism are known for only approximately 11 of its 30 species. We show that the nematode fauna associated with a population of Tropidurus montanus is composed of three species of host-generalist parasites with high overall prevalence. Male and female lizards did not differ in infection pattern and there was no relationship between host body size and intensity of infection for the most prevalent parasite species...
October 28, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27776573/morphological-and-molecular-characterization-of-cucullanid-nematodes-including-cucullanus-opisthoporus-n-sp-in-freshwater-fish-from-the-brazilian-amazon
#17
F B Pereira, J L Luque
Molecular and morphological characterization of two species of Cucullanidae from freshwater fish in Brazil are provided, one of which represented an undescribed taxon. Cucullanus opisthoporus n. sp. was collected in Cichla melaniae from River Xingu, State of Pará, and in C. pinima from River Jamarí, State of Rondônia. Nematodes referable to Cucullanus grandistomis were collected in Oxydoras niger from River Xingu. The new species has an appendage in the tail tip, ventrally covered by small spines, which is an exclusive feature of Cucullanus tucunarensis...
October 25, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27762182/ultrastructural-changes-to-the-tegumental-system-and-gastrodermal-cells-of-adult-fasciola-hepatica-following-treatment-in-vivo-with-a-commercial-preparation-of-myrrh-mirazid
#18
M M O Abdelaal, G P Brennan, A Abdel-Aziz, I Fairweather
An in vivo study in the laboratory rat model has been carried out to monitor changes to the tegument and gut of adult Fasciola hepatica following treatment with myrrh ('Mirazid'). Rats infected with the triclabendazole-resistant Dutch isolate were dosed orally with Mirazid at a concentration of 250 mg/kg and flukes recovered 2, 3 and 7 days post-treatment (pt). The flukes were processed for examination by scanning and transmission electron microscopy. A variety of changes to the external surface were observed, culminating in the sloughing of the tegumental syncytium...
October 20, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27762173/phylogenetic-patterns-of-haemonchus-contortus-and-related-trichostrongylid-nematodes-isolated-from-egyptian-sheep
#19
O M Kandil, K A Abdelrahman, H A Fahmy, M S Mahmoud, A H El Namaky, J E Miller
Haemonchus contortus is a major parasite of small ruminants and its blood-feeding behaviour causes effects ranging from mild anaemia to death. Knowledge of the genetic variation within and among H. contortus populations can provide the foundation for understanding transmission patterns and aid in the control of haemonchosis. Adult male H. contortus were collected from three geographical regions in Egypt. The second internal transcribed spacer (ITS2) of nuclear ribosomal DNA was amplified using the polymerase chain reaction (PCR) and sequenced directly...
October 20, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/26902671/pseudosuccinea-columella-experimental-co-infections-of-juvenile-and-pre-adult-snails-with-the-digeneans-calicophoron-daubneyi-and-fasciola-hepatica
#20
G Dreyfuss, P Vignoles, D Rondelaud
Experimental co-infections of juvenile and pre-adult Pseudosuccinea columella with Calicophoron daubneyi and Fasciola hepatica (five miracidia of each digenean per snail) were carried out to determine the aptitude of this lymnaeid to ensure complete larval development of the former parasite, the latter or both. Snails infected with F. hepatica were found in the two groups of juveniles, i.e. 1 and 2 mm at exposure, and the four groups of pre-adults, i.e. 3-6 mm. The highest frequency of F. hepatica, i.e. 37...
November 2016: Journal of Helminthology
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