Toxoplasmosis in sheep--the last 20 years.
نویسنده
چکیده
Sheep are important to the economy of many countries because they are a source of food for humans. Sheep are commonly infected with the protozoan parasite, Toxoplasma gondii. Infection with the parasite may cause early embryonic death and resorption, fetal death and mummification, abortion, stillbirth, and neonatal death. Severity of infection is associated with the stage of pregnancy at which the ewe becomes infected, the earlier in gestation, the more severe the consequences. Infected sheep meat is a source of T. gondii infection for humans and carnivorous animals. Most sheep acquire T. gondii infection after birth, and less than 4% of persistently infected sheep transmit the parasite vertically to the next generation. Recent studies by a group of researchers in England reported that repeat ovine transmission of T. gondii may be more common than previously believed but these findings are soley based on PCR data and require additional data using other techniques to verify the findings. Following infection with T. gondii, sheep develop humoral and cell-mediated immune responses against the parasite that provides effective protection against disease in subsequent pregnancies. A commercial vaccine is available, comprising a live, incomplete strain of T. gondii. The vaccine is administered to sheep prior to mating to protect against lamb losses due to toxoplasmosis. In the present paper, information on the prevalence, transmission, and control of ovine toxoplasmosis in the last 20 years is reviewed.
منابع مشابه
Study of resistance to Toxoplasmosis using Tachizoites surface antigens of Toxoplasma gondii in vivo
Taoxoplasma gondii is an important food-borne parasite transmitted primarily from animals to humans through meat consumption, mainly pork and lamb, as well as through oocysts shed by cats. Infection in humans can cause severe fetal malformations, ocular complications or encephalitis. Toxoplasmosis infection during pregnancy, especially in sheep, often results in abortion, representing considera...
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Toxoplasmosis is an important zoonotic diseases in human and animals. The disease caused by the protozoan Toxoplasma gondii. To determine the infection rate of toxoplasmosis in sheep and goats in east Azarbaijan province of Iran a total of 186 sera, 13 fetal brains, 13 cotyledons and 34 whole blood samples were collected from sheep and goats in Tabriz abattoir during the year 2010. Serum sample...
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1989 Serodiagnosis of ovine toxoplasmosis: an assessment of latex agglutination test and the value of IgM specific titres after experimental oocyst-induced infections. Research in Veterinary Science 46(1): 67–72 19. Tyson P D 1986 Climatic change and variability in southern Africa. Oxford University Press, Cape Town, South Africa 20. Van Heerden J & Van Rensburg I B J 1979 Toxoplasmosis in a do...
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ورودعنوان ژورنال:
- Veterinary parasitology
دوره 163 1-2 شماره
صفحات -
تاریخ انتشار 2009