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Protected means persons vaccinated within 10 years before
exposure or within 3 days after exposure. Partially protected
means persons vaccinated more than 10 years before exposure
(most of whom refused revaccination).
Unprotected means never successfully vaccinated, or vaccinated
more than three days after exposure.
These figures are absolutely conclusive as to the value of
the protection afforded by vaccination. The persons who
refused vaccination were equally healthy, equally well housed,
and well fed, and otherwise under equal advantages with those
who accepted it; many of them were strong young men
employed in the open air.
Of course there is some uncertainty about the term contact,
and in many cases the contact was doubtful and not direct,
but all were marked as contacts and as vaccinated or refusing
vaccination immediately the information was obtained and
before it was known whether they contracted infection or not,
so that the figures are absolutely comparable in the different
classes. All in the same house were put down as contacts,
though many (including four of the eight unprotected), it is
fairly certain were never in the same room as the patient.
All cases of Small-pox not previously down on the list of
contacts are of course excluded from the above table.
Condition of Cases as to Vaccination.
Table showing the number of cases and number of deaths
among the vaccinated and unvaccinated at various age
groups:—