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Abstract
Extract
Sir-The high incidence of leptospirosis in dairy farm workers is an important and continuing rural public health problem in New Zealand.(1) It has been suggested that vaccination of dairy cattle against Leptospira interrogans serovar hardjo and pomona infection will prevent milkers becoming infected.(4) We would like to report on a study of the protective effects on humans of such a vaccination programme in which a statistically significant (P=0.05, Fisher's exact test) effect was demonstrated. We also wish to draw attention to some aspects observed both in this study and in other surveys in the Waikato area conducted by one of us (T.J .R. ) which we consider could lead to unsatisfactory levels of protection.