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Among the families affected, 77 provided 78 primary cases,
one family having two original cases arising at the same time; 12
families of the above gave rise to further 25 secondary cases, and
one family other than the above gave one secondary case, making
a total of 78 families affected by the 104 cases. Eight of the
total cases of Small-pox were previously notified, or proposed to
be notified, as cases of the minor ailment Chicken-pox.
The local incidence per 10,000 of the population varies as
follows:—3.1 in Kidbrooke, 5.0 in West Greenwich, 8.2 in St.
Nicholas, 13.0 in East Greenwich, and 14.3 in Charlton, from
which it will be seen that East Greenwich and Charlton proportionately
provided by far the larger number of Small-pox cases.
The length of stay in the Hospital of the cases that occurred
and recovered in non-vaccinated persons varies from 25 up to 73
days, and averaged 51 days per patient.
The period of time under treatment at the Hospital in the
group of vaccinated persons amongst those patients that recovered,
varied from 10 up to 80 days, the average of the whole cases
being 29 days, or some 43 per cent, shorter time than amongst
those cases that were not vaccinated, hence the degree of assistance
rendered to enable the patient who had been vaccinated to
recover from the disease in a shorter time than the patient who
had not been so operated upon, is very well marked.
As to the source of infection in the various cases, forty were
distinctly and clearly traceable to previous cases in this or other
Boroughs, but the majority could only be approximately decided
upon.
In 13 cases, however, the infection undoubtedly appeared to
have been brought from the Small-pox Hospitals, 7 cases being in