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fection, but it may be that the original case was infected by a
healthy carrier inside, or outside, the school, or by contact with an
abortive case. The other cases followed within the incubation
period. Appropriate advice was given to the Headmistress, and the
outbreak terminated.
(h) Smallpox.
No cases occurred in the district, but a few possible contacts
were kept under surveillance for the required period.
Table 17 gives the statistcs relative to Vaccination, as recorded
by the General Practitioners of the district.

(i) Tuberculosis.
The increased number of notifications is, in the main, accounted
for by immigrants to the Harold Hill Estate, in whose case priority
has been given for rehousing. There is, however, no evidence of
increased infectivity because of this.
The work of the Medical Research Council into the value of
the Anti-Tuberculosis Vaccine B.C.G., on which I commented in
my last report, was continued during the year. The Research
Council will also have to follow up those children who have already
participated in the scheme, but who have left school. The Health
Visitors are very willing to co-operate, and maintain the enthusiasm
of the children, which may be no easy matter.