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(19)
who had recently undergone vaccination or re-vaccination
had been admitted suffering from Small Pox."
The contrast between the age incidence of Small
Pox upon the vaccinated and upon the unvaccinated
is very striking.
Twelve out of the total of 19 unvaccinated cases
occurred in the first quinquennium of life, whereas
among the vaccinated none occurred at that period,
and it is not until the quinquennium 25 to 30 is
reached that the maximum incidence amongst the
vaccinated is attained.
All the unvaccinated cases occurred in persons
under 25 years of age, and out of 19 such cases 5, or
more than a fourth of those attacked, died.
Among the 49 vaccinated cases 12 occurred in
persons under 25 years of age, and none died.
Although among the vaccinated none were
admitted who had been recently vaccinated, and so
none who could be said to be completely protected by
vaccination, the influence of vaccination in modifying