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Strain Ai was isolated during an epidemic in Transcaucasia in 1964. Cattle immunized with type A, strain 103 (variant A7) were not fully immune to strain Ai. Complement fixation tests and cross-infection experiments on g.pigs showed that Ai was a new variant, differing from standard type A variant...

Larda, P. N.; Salazhov, E. L.; Antonyuk, V. P.
Veterinariya, 1966, 1, pp 20-22 pp.