Venezuelan equine encephalomyelitis vaccine (strain TC-83): a field study.

In 1971, more than 370 horses in south Texas were studied with respect to their clinical, virologic, and neutralizing antibody responses to vaccination with Venezuelan equine encephalomyelitis (VEE) strain TC-83. This study confirms reported findings that the vaccine used in the 1971 epizootic in the lower Rio Grande Valley of Texas was safe and efficacious. Vaccinal virus viremia titers were generally below the postulated infection threshold of epizootic vectors. In general, reactions to the vaccine were minimal and transient, with no observed abortions or deaths attributable to use of the vaccine. Eleven months after vaccination, VEE antibody titers were demonstrable in most horses that had VEE antibodies within 30 days after vaccination. Presence of western equine encephalomyelitis antibody titers of greater than or equal to 1:50 at time of VEE vaccination appears to modify or to interfere with VEE antibody production.

Epidemiology of mycobacterial lymphadenitis in an Idaho swine herd.

A study of Mycobacterium avium infected swine in an Idaho herd was made to obtain information on morbidity and to evaluate some control measures. Of 867 pigs slaughtered during a 30-day period in May and June, 1974, 100 carcasses were condemned or passed for cooking and 406 carcasses had lesions in one lymph node and were passed without restriction. Mycobacteriologic examinations were made on 33 pigs which were tuberculin tested. Mycobacterium avium was isolated from 21 of 26 tuberculin positive pigs and from 4 to 7 tuberculin negative pigs. Lymphocyte stimulation tests were completed for 12 pigs. Positive results were observed in 11 and M. avium was isolated from 7. Mycobacterium avium serotypes 1,2,4,8, and 9 were identified.