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Abstract
Extract
Sir, —A recent issue of the Animal Health Division's excellent publication Surveillance (1978 No.5 Spring), reported that the Palmerston North Animal Health Laboratory had encountered a case involving 40 two-year-old rams, the majority of which had intramuscular perirenal abscesses. It was reported that these abscesses were due to vaccination with a single dose of Br. ovis vaccine, administered by the intraperitoneal route.