This ultrastructural study has shown that there is a layer of dense flocculent material on the surface of juvenile Fasciola hepatica incubated in vitro with specific bovine antiserum. This material corresponds to the complexes of secreted glycocalyx and bovine antibody previously characterized by fluorescence microscopy. Bovine eosinophils attach closely to those regions of the parasite's surface that are free of flocculent precipitates. This close attachment is followed by degranulation of the eosinophils into the narrow zone between the cells and the parasite. Only in these regions is damage, in the form of vacuolation of the tegument, seen within the juvenile F. hepatica. It is concluded that the inability of bovine eosinophils to kill juvenile F. hepatica in the presence of specific antiserum results from the presence of a protective layer, consisting of antigen/antibody complexes, on the parasite's surface.
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http://dx.doi.org/10.1017/s0031182000062703 | DOI Listing |
Rev Bras Parasitol Vet
January 2025
Department of Biochemistry, College of Science, King Saud University, Riyadh, Saudi Arabia.
A total of 384 animals (sheep, goat, cattle, and buffalo) were examined for the presence of hydatid cysts only in the lungs. The lung tissue samples associated with the hydatid cyst were collected immediately after slaughter, followed by fixation in 10% formalin. The fixed tissue was subjected to paraffin embedding technique.
View Article and Find Full Text PDFAm J Trop Med Hyg
December 2024
Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
Parasit Vectors
December 2024
United States Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Centre, Animal Parasitic Diseases Laboratory, Beltsville, MD, 20705-2350, USA.
Background: Parasites in the apicomplexan genus Sarcocystis infect cattle worldwide. Assessing the economic importance of each such parasite species requires proper diagnosis. Sarcocystis cruzi, a thin-walled species, infects virtually all cattle.
View Article and Find Full Text PDFVet Med Sci
January 2025
Department of Pathobiology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran.
Background/objective: Linguatula serrata (L. serrata) is a worldwide zoonotic parasite and one of the most widespread pathogens. This study aimed to determine the prevalence of L.
View Article and Find Full Text PDFTransl Anim Sci
September 2024
Department of Agricultural Sciences, West Texas A&M University, Canyon, TX, USA.
The objective of this study was to evaluate the impacts of stress challenge duration on metabolic, hematologic, and rumen fermentation parameters of beef steers. Thirty steers (416 ± 19 kg) were used in a randomized complete block design with 2 blocks and 3 treatments. Treatments were intravenous injection of (1) saline at 0, 24, 48, and 72 h ( = 10; control); (2) corticotropin-releasing hormone (CRH) and vasopressin (VP) at 0 h and saline at 24, 48, and 72 h ( = 10; acute); or (3) CRH and VP at 0, 24, 48, and 72 h ( = 10; chronic).
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