A study of cattle-to-cattle transmission of Mycobacterium bovis infection |
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Authors: | E Costello ML Doherty ML Monaghan FC Quigley PF O'Reilly |
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Institution: | *Veterinary Research Laboratory, Abbotstown, Dublin 15, Ireland;?Facutly of Veterinary Medicine, University College Dublin, Ballsbridge, Dublin 4, Ireland |
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Abstract: | Twenty steers, positive to the single intradermal comparative tuberculin test (SICTT), were selected fromherds with a recent history of Mycobacterium bovis infection. Ten steers, negative to SICTT, were selected from herds with no history of M. bovis infection and served as in-contact animals. The animals were divided into 10 groups, each consisting of two SICTT-positive (reactor) animals and one in-contact animal. Each group was housed in an individual loose-box for a period of 1 year. Five of the groups were fed a restricted diet for part of the experiment. All cattle were slaughtered at the end of the study period and examined at post mortem. Transmission of infection to an in-contact animal occurred in four of the 10 groups. One of the four in-contact animals, which became infected, had a retropharyngeal lymph node tubercle and M. bovis was isolated from lymph nodes without visible lesions from the other three. Two of the infected in-contact animals without visible lesions did not show any detectable cell-mediated immune response. There was no evidence that dietary, restriction had any effect on transmission of disease. |
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Keywords: | Keyworrds: Cattle tuberculosis transmission of infection diet |
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