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The rapid increase in cases in the three age periods, 0.10,
10-20, and 20-40 is noteworthy and is exactly the opposite of
what occurs in other infectious diseases, such as Measles and
Scarlet Fever, and is also the opposite of what occurred with
Small-pox before the introduction of vaccination. There
cannot be the least doubt that this changed age distribution
is solely due to vaccination, and indicates that the protection
afforded by primary vaccination gradually diminishes as age
advances. The five cases under five years of age had never
been vaccinated, and five of the nine cases between five and
ten years had also never been vaccinated.
9. Interval between Onset and Removal.—In 240 cases
where the onset was definitely ascertained, the average interval
between onset and removal was 4.13 days. Two cases were
not recognised for 12 and 16 days respectively.
Duration.—In 200 cases which recovered, the duration
(reckoned to date of discharge from Hospital) averaged 36.4
days, and in 40 cases which died, it averaged 14.1 days. The
duration both for recoveries and deaths was greater in the
unvaccinated than in the vaccinated cases, being 53.1 and
16.5 days respectively for the unvaccinated, and 34.4 and 11.9
for the vaccinated.
10. Mortality.—Of the 245 cases, 205 recovered and 40
died, giving a case death rate of 16.3. Among the 194 cases
known to be vaccinated, the deaths were 24 and the case
death rate 12.3, while among the 38 unvaccinated, the deaths
were 15 and the case death rate 39.5; i.e., for equal numbers
attacked three unvaccinated persons died to every vaccinated
person.
Of those referred to as vaccinated only 4 had been
revaccinated and one of these died, she was a woman aged 51