Abstract
Mastitis caused by intramammary infections of environmental origin has become the dominant udder health ‘pattern’ for dairy herds in the UK and many other countries, compared with the situation 40–50 years ago when contagious mastitis patterns predominated. The diagnosis of environmental mastitis in dairy herds requires epidemiological data from clinical mastitis cases and individual cow somatic cell count (SCC) data as well as information regarding likely aetiology from samples submitted for bacteriology. This article reviews the diagnosis of environmental mastitis caused by intramammary infections of lactating period origin, and examples of patterns to illustrate these herd patterns.
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