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During a serological study of 56 samples from cows, taken from prosperous farms, were proved in 37.5% neutralizing antibodies against the MD-VD, whereas the study of 89 samples from cows, taken from failing farms, the neutralizing antibodies against the same virus were 50.3%. Out of the 145 serum samples from calves, originating from prosperous farms 30.5% proved positive for neutralizing antibodies against the MD virus. Out of the 151 samples from calves, originating from failing farms, 65.7% proved positive. The data show the high degree of dissemination of the virus of that disease both on prosperous and on failing farms.
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