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WE would like to report an unusual manifestation of Mycoplasma bovis mastitis in dairy cattle.
Four separate outbreaks have been investigated on farms in Shropshire, Cheshire and north-east Wales over the past 18 months. All have involved several cases (five to 10) occurring in a cluster over a period of two to three weeks.
The cows presented with multiple quarters affected (often all four) between 10 days and five weeks after having been dried off with a combination of an intramammary antibiotic (in three of the herds cefalonium dehydrate and in the fourth herd framycetin sulfate, penethamate hydriodide and procaine penicillin combination) and an intramammary teat sealant. In each of the herds, several cows were dried off at the same time; however, not all were affected. In three of the herds no obvious risk factors associated with the animals' handling, teat preparation or infusion technique were identified and the affected animals often had historically low somatic cell counts and no record of clinical mastitis in the previous lactation. A potential failing was identified on one farm (farm B) where the …