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Giardia duodenalis and Cryptosporidium spp. are common enteric protozoan parasites in production animals, including cattle. Typically, both the clinical outcome of these infections and the distribution of G. duodenalis assemblages and Cryptosporidium species are age-dependent, with the occurrence of diarrhoeal disease being mainly associated with young animals and sub-clinical, low intensity infections being predominantly found in adult animals. To investigate the prevalence and genetic diversity of G. duodenalis and Cryptosporidium spp. in asymptomatic adult cattle, a total of 362 faecal samples were collected in four farms in the province of Álava, Northern Spain, between November 2011 and December 2012. The presence of G. duodenalis was estimated by real-time PCR, and the assemblages were determined by multilocus sequence-based genotyping of the glutamate dehydrogenase and β-giardin genes of the parasite. Detection and identification of Cryptosporidium species was carried out by sequencing of a partial fragment of the small-subunit ribosomal RNA gene. Overall, G. duodenalis and Cryptosporidium spp. were detected in 68 (18.8%) and 45 (12.4%), respectively, of the 362 animals tested. Strikingly, four isolates representing two novel sub-types of G. duodenalis assemblage F were identified at the gdh, but not the bg, locus. This is the first report describing the presence of the feline-specific G. duodenalis assemblage F in bovine isolates. Additionally, five (three novel and two known) sub-types of G. duodenalis assemblage E were also identified at the gdh locus and a single one (assigned to sub-assemblage EII) at the bg locus. Of nine Cryptosporidium isolates, four (including a novel sub-type) were assigned to the cat-specific C. felis, two were typed as C. bovis, and the remaining three were only characterized at the genus level. Data presented here provide epidemiological and molecular evidence demonstrating that the host range specificity of G. duodenalis assemblages and Cryptosporidium species may be wider than previously anticipated.
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http://dx.doi.org/10.1016/j.vetpar.2015.02.028 | DOI Listing |
Vet Med Sci
January 2025
Leishmaniasis Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran.
Background: Giardia duodenalis is a pathogenic protozoan responsible for gastrointestinal infections in various hosts, including rabbits. Understanding its epidemiology, genetic diversity and zoonotic implications is vital for public health and veterinary medicine. This systematic review and meta-analysis aimed to synthesize global data on the prevalence of G.
View Article and Find Full Text PDFGut Pathog
December 2024
Department of Parasitology, Faculty of Medicine, Suez Canal University, Ismailia, 41522, Egypt.
Background: Giardia duodenalis (G. duodenalis) is an intestinal protozoan parasite of human and animal hosts. The present study investigated and compared the assemblages of G.
View Article and Find Full Text PDFPLoS Negl Trop Dis
December 2024
Parasitology Reference and Research Laboratory, Spanish National Centre for Microbiology, Health Institute Carlos III, Majadahonda, Madrid, Spain.
Background: PCR-based screenings on the presence of diarrhoea-causing intestinal protist species are limited in Zambia, resulting in inaccurate current prevalence and epidemiological data. Sensitive PCR-based methods are particularly well suited for detecting subclinical infections in apparently healthy carriers.
Methodology: In this prospective cross-sectional study, we investigated the occurrence of the most common intestinal protists in an apparently healthy paediatric population (5-18 years) in Lusaka Province, Zambia.
Zoonoses Public Health
December 2024
Parasitology Reference and Research Laboratory, National Centre for Microbiology, Majadahonda, Madrid, Spain.
Introduction: Intestinal microeukaryote parasites are major contributors to the burden of diarrhoea in humans and domestic animals, but their epidemiology in wildlife is not fully understood. We investigated the frequency, genetic diversity and zoonotic potential of protists of animal and public health significance in free-ranging grey wolf (Canis lupus) populations in south-western Europe.
Methods: Individually formed faecal samples collected from necropsied wolves or scat trails in Italy (n = 47), Portugal (n = 43) and Spain (n = 225) during the period 2011-2023 were retrospectively analysed using molecular (PCR and Sanger sequencing) methods.
BMC Vet Res
November 2024
National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, Key Laboratory of Parasite and Vector Biology, Collaborating Center for Tropical Diseases, National Institute of Parasitic Diseases, Chinese Center for Diseases Control and Prevention (Chinese Center for Tropical Diseases Research), National Health Commission of the People's Republic of China (NHC), World Health Organization (WHO), National Center for International Research on Tropical Diseases, Shanghai, 200025, China.
Background: Giardia duodenalis (G. duodenalis) is a globally distributed zoonotic protozoan that parasitizes the small intestines of humans and various mammals, such as goats and sheep. The objective of this study was to establish a convenient, accurate, and specific method based on restriction fragment length polymorphism (RFLP) for genotyping assemblages A, B and E of G.
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