SEROLOGICAL RESPONSES OF SHEEP AND CATTLE EXPOSED TO NATURAL TOXOPLASMA INFECTION

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Abstract
During a four and a half year period a group of cattle was grazed continuously with a group of sheep and observed for Toxoplasma antibodies. Initially, there were 25 cattle and 31 sheep, but these were reduced to 19 and 18, respectively, by the end of the observation. Only transient antibody responses were noted in 2 cattle, whereas persistent titres developed in 12 sheep. Interpreted in the light of available information, these results were taken to indicate that cattle do not readily acquire persistent T. gondii infections.

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