Labile neurotoxin in serum of calves with "nervous" ...

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Title Labile neurotoxin in serum of calves with "nervous" coccidiosis
Author(s) C. M. Isler, James E. C. Bellamy, G. A. Wobeser
Journal Canadian Journal of Veterinary Research = Revue Canadienne de Recherche Veterinaire
Date 1987
Volume 51
Issue 2
Start page 253
End page 260
Abstract Mouse inoculation was used to test for the presence of a toxin in the serum, cerebrospinal fluid, and intestinal contents collected from cases of bovine enteric coccidiosis, with and without neurological signs, and from control calves. Intravenous inoculation of mice with 10 mL/kg of serum from calves showing nervous signs caused effects significantly different from those caused by the inoculation of serum from calves not showing nervous signs and from control calves. The effect was particularly evident in female mice. At this dosage severe neurological signs such as loss of righting reflex, seizures and death occurred only with serum from calves with "nervous coccidiosis". The results suggest that serum from the calves with neurological signs contains a neurotoxin. This toxin appears to be highly labile. It was not present in the cerebrospinal fluid at levels comparable to those in the serum. The significance of this labile neurotoxin with respect to the pathogenesis of the neurological signs associated with bovine enteric coccidiosis is unknown.

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