Related Experiment Video
Updated: Aug 11, 2026
17:15
Catheterization of Intestinal Loops in Ruminants
Published on: June 11, 2009
Summary
A novel Cryptosporidium species, distinct from C. parvum, was identified in cattle, causing prolonged shedding and abomasal inflammation. This finding impacts our understanding of bovine cryptosporidiosis.
Area of Science:
- Veterinary Parasitology
- Gastroenterology
- Microbiology
Background:
- Cryptosporidium is a significant enteric pathogen in livestock.
- Previous studies focused on intestinal Cryptosporidium, often C. parvum-like oocysts.
- The abomasum as a site for Cryptosporidium infection in cattle was less understood.
Purpose of the Study:
- To characterize a newly identified Cryptosporidium species in cattle.
- To investigate the shedding patterns and host-parasite interactions of this novel Cryptosporidium.
- To describe the resulting abomasal pathology.
Main Methods:
- Oocyst isolation and morphological analysis from fecal samples of a calf and feedlot steers.
- Histopathological examination of abomasal tissues.
- Observation of oocyst shedding patterns over an extended period.
Main Results:
- Identification of Cryptosporidium oocysts larger and more oval than C. parvum-like oocysts in the abomasal peptic glands.
- Massive Cryptosporidium populations observed in the abomasal glands of infected animals.
- Continuous oocyst shedding for months in steers, contrasting with the transient shedding of C. parvum-like oocysts.
- Abomasal mucosal thickening (approx. 10%), widened gland lumens, and epithelial atrophy were observed.
Conclusions:
- A novel Cryptosporidium species, distinct from C. parvum, infects the abomasum of cattle.
- This abomasal cryptosporidiosis presents a unique shedding pattern and induces significant mucosal changes.
- Further research is needed to elucidate the host-parasite interactions and clinical significance of this newly identified pathogen.
Related Concept Videos
01:28Fungal Phylum Microsporidia
Microsporidia are a group of obligate intracellular fungi that were initially classified as protists but were later reclassified based on phylogenetic, molecular, and structural evidence linking them to the Chytridiomycota. These unicellular, non-motile organisms are highly specialized parasites that infect a wide range of animal hosts, including humans. They have evolved extensive genomic and metabolic reductions, making them highly dependent on their hosts for survival.Morphology and Genomic...
01:27Cryptococcal Meningitis
Cryptococcal meningitis is a life-threatening opportunistic infection predominantly associated with HIV/AIDS, accounting for over 100,000 deaths annually worldwide. However, it also affects individuals with other forms of immunosuppression, including those undergoing immunosuppressive therapy, organ transplant recipients, patients with innate immunodeficiencies, and individuals with hematological disorders. The infection is caused mainly by Cryptococcus neoformans and Cryptococcus gattii,...
01:28Toxoplasmosis
Toxoplasmosis, a zoonotic disease caused by the protozoan Toxoplasma gondii, poses significant public health challenges globally due to its high seroprevalence and varied clinical manifestations. As an obligate intracellular parasite, T. gondii can infect all warm-blooded vertebrates, but felids are its only definitive hosts, shedding unsporulated oocysts into the environment. Humans typically acquire the infection through ingestion of tissue cysts in undercooked meat or oocysts from...
01:12Giardiasis
Giardiasis is a globally prevalent intestinal infection caused by the protozoan parasite Giardia duodenalis (also known as G. lamblia or G. intestinalis). This flagellated protozoan is the most frequently identified intestinal parasite in the United States and worldwide. Transmission primarily occurs via the fecal-oral route, with infection arising from ingestion of water or food contaminated with cysts. Individuals in low-resource settings, international travelers, outdoor enthusiasts, daycare...
01:28Amebiasis
Entamoeba histolytica, a protozoan parasite, is responsible for intestinal and extraintestinal amebiasis. Though a significant proportion of infections remain asymptomatic, approximately 50 million individuals annually are estimated to present with clinical disease, resulting in up to 100,000 deaths globally. The disease burden is disproportionately high in regions with lower socioeconomic status, such as parts of India, Africa, Mexico, and Latin America.Etiology and TransmissionThe infective...