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The twenty-eight secondary samples were obtained on the
occasion of the veterinary surgeon's visit to the farms in Sussex,
Surrey and Kent, following positive results obtained from the
examination of primary samples of the milk from the farms.
On these visits one hundred and thirteen cows were examined
by the veterinary surgeon. In one case a cow was found with
a clinically tuberculous udder, while in one other case the milk
obtained from a suspected cow was found on examination to be
tuberculous.
In three other cases no clinical evidence of tuberculosis of the
udder was found, and examination of secondary samples obtained
from the mixed milk of groups of cows gave negative results. In
each of these cases, however, there had been changes in the herds
in the interval between procuring the sample and obtaining the
result.
In the case of the milk from Somerset, further investigation
was undertaken by the County Medical Officer of Health.
Further samples from the milk consigned from all 'hese farms
were taken at a later date, the examination in each case giving a
negative result.