The frequency distribution of female Haemonchus contortus bahiensis Grisi, 1974 in sheep from Venezuelan arid zones is 15.32% for the type with vulvar flap, 51.6% for the vulvar-knob and 33.07% for smooth type. A Shannon-Weaver diversity index corresponding to 1.44 bits was calculated for these forms with similarities in the general size, egg-size and in the number of the longitudinal cuticular ridges. An aggregated kind of distribution in the host population according to the K parameter of a negative binomial distribution was recorded for male and female worms. A complicated interaction was observed between the abundance, aggregation and prevalence of this ecotype and the importance of these findings is discussed with regard to host-parasite relationships.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1590/s0074-02761987000300007 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Naturally occurring variation in a cytochrome P450 modifies thiabendazole responses independently of beta-tubulin.
PLoS Pathog
January 2025
Department of Biology, Johns Hopkins University, Baltimore, Maryland, United States of America.
Widespread anthelmintic resistance has complicated the management of parasitic nematodes. Resistance to the benzimidazole (BZ) drug class is nearly ubiquitous in many species and is associated with mutations in beta-tubulin genes. However, mutations in beta-tubulin alone do not fully explain all BZ resistance.
View Article and Find Full Text PDFStudy of the Drug Resistance Function of Ivermectin-Resistance-Related miRNAs in Haemonchus contortus.
Acta Parasitol
January 2025
Ministry of Agriculture Key Laboratory of Clinical Diagnosis and Treatment Technology in Animal Disease, College of Veterinary Medicine, Inner Mongolia Agricultural University, Inner Mongolia Hohhot, Hohhot, China.
Haemonchus contortus has caused significant economic losses in many regions. The emergence of drug resistance has created new difficulties for the prevention and control of parasitic diseases in cattle and sheep. The mechanism of drug resistance to ivermectin in H.
View Article and Find Full Text PDFGoondicones A-H: Spiro-Isoindolinone Heartworm Anthelmintics from an Australian Pasture-Soil-Derived sp.
Antibiotics (Basel)
December 2024
Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072, Australia.
Background/objectives: There is an urgent need for new and improved anthelmintics that are not constrained by existing resistance pathways and that can safeguard the health and welfare of animals.
Methods: An integrated platform of chemical, bioassay, and cultivation profiling applied to a library of microbes isolated from Australian livestock pasture soil was used to detect and guide the production, isolation, characterization, identification, and evaluation of new natural products with anthelmintic properties.
Results: A global natural products social (GNPS) molecular network analysis of 110 Australian pasture-soil-derived microbial extracts prioritized for antiparasitic activity identified unique molecular families in the extract of sp.
Short communication: Exploring gastrointestinal tract nemabiomes in captive ungulates at the SANBI National Zoological Gardens: A next-generation sequencing baseline approach.
J Helminthol
January 2025
Foundational Research and Services, South African National Biodiversity Institute, P.O. Box 754, Pretoria0001, South Africa.
Gastrointestinal tract (GIT) nematode infections have a significant negative impact on the well-being and productivity of animals. While it is common for a host to be co-infected with multiple species of nematode parasites simultaneously, there is a lack of effective tools to study the composition of these complex parasite communities. We describe the application of the "nemabiome" amplicon sequencing to study parasitic GIT nematode communities in captive wildlife at the National Zoological Garden, South African National Biodiversity Institute.
View Article and Find Full Text PDFThe anthelmintic activity of the white wormwood (Artemisia herba Alba) against Haemonchus contortus in beef cattle.
Sci Rep
January 2025
Department of Agriculture, Women's University in Africa, 549 Arcturus Road, Harare, Zimbabwe.
The objective of the study was to determine the efficacy of white wormwood on helminthes in beef cattle production. Water extracts of white wormwood of different levels of phytotoxicity were used to treat female adult H. contortus over 8 h under controlled laboratory conditions.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!