Abstract
During the past year we have investigated herd outbreaks of an unusual respiratory syndrome in two widely separated dairy herds in New York State and one in Canada. The Canadian herd consisted of approximately 70 purebred Holstein milking animals; one of the N.Y. herds was comprised of 40 purebred Guernsey milkers and the other was a “commercial” dairy consisting of approximately 70 head, mostly Holsteins with a few Guernseys and Jerseys. In each herd, the history, signs, progression of the syndrome and subsequent sequellae have been identical.
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