Epidemiology and control of bovine ephemeral fever.

Vet Res · 2015 · PMC4624662 · PMID 26511615

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a clear trendno p-value reported

There has been a clear trend towards more frequent epizootics since 1967 with falling morbidity rates but increasing case-fatality rates.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.