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disease was prevalent. The immunity conferred by infant vaccination
had been renewed in his case by adult re-vaccination. The
opportunities for infection were the same for all these members of
the family, but only the least protected one of the family acquired
the disease. In my opinion, the incident affords a striking illustration
of the protective value of vaccination in a threefold form, viz.,
the protection of the children, who had been vaccinated in infancy,
the waning influence of vaccination with advancing years, but still
exercising an influence upon the severity of the disease, and the
revival of protection by re-vaccination. Arthur B. had also been
well vaccinated in infancy, and the mildness of his attack showed
that he, too, had benefited by this vaccination.
My thanks are due to Mr. F. R. Coles (the Clerk to the Guardians)
for kindly supplying me with details respecting vaccinations and
re-vaccinations.
I am, Gentlemen,
Your obedient Servant,
J. KING WARRY, M.D., D.P.H.,
Medical Officer of Health.
Public Health Department,
Town Hall, Hackney, N.E.
April, 1911.