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Of the 245 cases, 193 had been vaccinated in infancy, 42
were unvaccinated, and the vaccination of 10 was doubtful.
Thus 17 per cent. of the eases at least were unvaccinated.
It is impossible to say exactly the proportion of vaccinated to
unvaccinated in the general population of the Borough, but
three sources of information enable me to form a rough
estimate:—they are (1) the examination of many hundreds of
persons for life insurance in the past seven years; (2) the
information obtained as to the vaccination of contacts; (3) the
information supplied by the public vaccinators as to the
numbers of unvaccinated children discovered in the primary
schools. From these sources I estimate the number of un
vaccinated in the Borough to be decidedly below five per cent.
Thus for equal numbers of vaccinated and unvaccinated persons
at least three times as many unvaccinated were attacked.
All the cases under five years of age—five in number—were
unvaccinated. Of the seven cases between five and ten years,
three were vaccinated and four unvaccinated; the vaccinated
were all aged seven years.
No vaccinated child under seven years of age was attacked.
In one family, in spite of early removal to Hospital, the
first case infected three others, making four in all, of whom