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The most recent prospective national survey was carried out across England and Wales in 2004-05 and quantified the UK situation with regard to clinical disease incidence and the pathogens involved in both clinical and sub-clinical disease. This work was published in the Veterinary Record, and a copy of the full paper can be requested here.

Of the 125 dairy herds surveyed, 97 returned samples and data to enable analysis to be performed. The incidence rate of clinical mastitis cases (cases per 100 cows per year) from 90 dairy herds across England and Wales is shown below, with almost a quarter of herds reporting greater than 100 cases per 100 cows per year. The study concluded that the incidence of clinical mastitis in dairy herds in England and Wales  at this time was somewhere between 47 and 65 cases per 100 cows/year; higher than previously thought.

The distribution of clinical mastitis incidence rates in UK dairy herds.
An illustration of the distribution of clinical mastitis incidence rates in UK dairy herds.