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119
Children living in houses actually invaded, were of course exposed to
an intenser and more continuous infection.
Per thousand of the number of children of each class living
in invaded houses:—
The attack rate of the vaccinated was 78
The attack rate of the unvaccinated was 869
The death rate of the vaccinated was 1
The death rate of the unvaccinated was 381
Under these extreme yet identical circumstances, therefore, the
vaccinated children had, as compared with the unvaccinated, an
11-fold immunity from attack by small-pox and a 381-fold
security against death by small-pox.
In bye-gone days the rate of small-pox mortality was much higher
among children under 10 years of age, than in persons above
that age. The converse is now the fact, owing to the superior
protection afforded to the children under Compulsory Vaccination
Law.
B. The protective influence of vaccination is further illustrated by Dr.
Buchanan, as follows:—
Concerning persons over 10 years of age under the common
conditions of infection in the borough.
Per thousand of the number of persons over 10 in each class :
The attack rate in persons twice vaccinated
was 3
The attack rate in persons once vaccinated
was 19
The attack rate in persons not vaccinated was 94
The death rate among persons twice vaccinated
was 0.08
The death rate among persons once vaccinated
was 1.0
The death rate among persons not vaccinated
was 51.0
Or to state the difference in other terms: For 100,000 persons over 10
years old and twice vaccinated, the rate of small-pox mortality
actually observed would give eight deaths. For 100,000