Review of equine Cryptosporidium infection

Diarrhoea is one of the most important diseases of foals and 7 0 4 0 % are affected within the first 6 months of life (Palmer 1985). Although the cause is multifactorial and changes in the physiology and nutrition of foals are sometimes responsible, diarrhoea is frequently the result of infection by enteropathogens such as bacteria, viruses and nematodes (Palmer 1985; Tzipori 1985). There is increasing evidence that Cryptosporidium infection can also cause diarrhoea in foals (Austin et a/. 1990; Kim 1990). Cryptosporidiosis in horses is caused by Cryptosporidium parvum, a coccidial parasite infective to mammals. C. muris has been reported in foals in Italy (Canestri-Trotti and Visconti 1985). but its identity was questionable because the reported size of oocysts was within the range of C. paivum (Kim 1990). Like other coccidia, the infective stage for Ciyptosporidium is the sporulated oocyst. Unlike the others, the sporulation of Ciyptosporidium occurs within the microvillous border of the small intestine. Therefore, newly excreted Cryptosporidium oocysts are infective to other hosts immediately. In addition, there are two types of oocysts in Ciyptosporidium: ( I ) thin-walled oocysts that exist within the intestine shortly after their formation and re-initiate infection (autoinfection), and (2) thick-walled oocysts that are excreted in faeces and are responsible for the transmission of infection from one animal to another (Current and Garcia 1991).

[1]  R. Herd,et al.  Epidemiology of equine Cryptosporidium and Giardia infections. , 1994, Equine veterinary journal.

[2]  R. Herd,et al.  Concurrent infections of Giardia and Cryptosporidium on two Ohio farms with calf diarrhea , 1993, Veterinary Parasitology.

[3]  R. Herd,et al.  Diagnosis of Cryptosporidium on a sheep farm with neonatal diarrhea by immunofluorescence assays , 1993, Veterinary Parasitology.

[4]  J. Revillard,et al.  Cryptosporidium parvum sporozoite staining by propidium iodide. , 1992, International journal for parasitology.

[5]  J. Sullivan,et al.  Threshold of detection of Cryptosporidium oocysts in human stool specimens: evidence for low sensitivity of current diagnostic methods , 1991, Journal of clinical microbiology.

[6]  T S Mair,et al.  Concurrent cryptosporidium and coronavirus infections in an Arabian foal with combined immunodeficiency syndrome , 1990, Veterinary Record.

[7]  C. Kim Cryptosporidiosis in pigs and horses. , 1990 .

[8]  K. Angus Cryptosporidiosis in ruminants. , 1990 .

[9]  J. Foreman,et al.  Cryptosporidium sp.: a cause of diarrhea in immunocompetent foals. , 1990 .

[10]  C. Sterling,et al.  Comparison of conventional staining methods and monoclonal antibody-based methods for Cryptosporidium oocyst detection , 1989, Journal of clinical microbiology.

[11]  R. Corstvet,et al.  Prevalence of Cryptosporidium sp in equids in Louisiana. , 1989, American journal of veterinary research.

[12]  R. Chermette,et al.  Survey on equine cryptosporidiosis in Normandy , 1989 .

[13]  S. Tzipori Cryptosporidiosis in Perspective , 1988, Advances in Parasitology.

[14]  D. Bruckner,et al.  Fluorescence detection of Cryptosporidium oocysts in human fecal specimens by using monoclonal antibodies , 1987, Journal of clinical microbiology.

[15]  J. Caron,et al.  Cryptosporidiosis in two foals. , 1985, The Canadian veterinary journal = La revue veterinaire canadienne.

[16]  J. Palmer Gastrointestinal Diseases of Foals , 1985, Veterinary Clinics of North America: Equine Practice.

[17]  S. Tzipori,et al.  The relative importance of enteric pathogens affecting neonates of domestic animals. , 1985, Advances in veterinary science and comparative medicine.

[18]  C. Reinemeyer,et al.  Absence of cryptosporidium oocysts in faeces of neonatal foals. , 1984, Equine veterinary journal.

[19]  J. Gibson,et al.  Cryptosporidiosis in Arabian foals with severe combined immunodeficiency. , 1983, Australian veterinary journal.

[20]  S. Tzipori,et al.  Cryptosporidiosis in animals and humans. , 1983, Microbiological reviews.

[21]  S. Tzipori,et al.  Prevalence of Cryptosporidium Antibodies in 10 Animal Species , 1981, Journal of clinical microbiology.

[22]  Anderson Bc Patterns of shedding of cryptosporidial oocysts in Idaho calves. , 1981 .

[23]  B. C. Anderson Patterns of shedding of cryptosporidial oocysts in Idaho calves. , 1981, Journal of the American Veterinary Medical Association.

[24]  S. Snyder,et al.  Cryptosporidiosis in Immunodeficient Arabian Foals , 1978, Veterinary pathology.