Examinations were carried out on the extent of infections and successive countermeasures of cleaning on a farm where pigs were suffereing from mycobacterial infections at a high ratiol.
1. The rate of condemnation of the intestine due to mycobacterial infections was 8.6 to 52.7% per month, or 24.6%(182 of 741 pigs) in a slaughterhouse over a period from February to October, 1982.
2. Mybcoacteria were isolated from various lymph nodes, including the tonsil, and sawdust at a ratio of 47.1%(8/17 pigs) and 88.9%(8/9 samples), respectively. Those of porcine origin belonged to
Mycobacterium intracellulare, and those of origin to this and other species.
3. The ratio of positive reaction to avian-type tuberculin was 37.9%(272/718 swine) on the farm until August. The reaction changed to negative in September.
4. The farm could completely be cleaned up in about 8 months by countermeasures, consisting of exposure and condemnation of those positive for tuberulination, environmental control and disinfection of the farm.
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