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(2) Wood Street Boys' School.—The first case had attended
school between 16th and 21st January whilst infectious, and
apparently gave rise to two further cases.
(3) Mission Grove School.—A child notified on the 7th November
had attended this school between the 1st and 5th November while
infectious, but no further cases arose.
In addition, 4 other school cases had attended 4 other schools on
the day of onset of this disease, but in each case nothing further
arose, suggesting that the disease is not infectious on the day of
onset.

Taking these figures as an average, it appears that only some
quarter of the school population is protected against Smallpox, a
finding in close agreement with the experience of 1930.
(b) Diphtheria.—186 cases of clinical Diphtheria occurred
amongst school children during 1931, and 11 cases of the nonclinical
type. During 1930, the figures were 301 and 41 respectively.
The diminished incidence was gratifying, but at the same time
was largely due to factors which cannot be controlled. On the
other hand, the disease can be fought scientifically and lifelong
protection can be afforded by immunisation, which should be made
available to all parents who wish their children to be protected.
Two localised outbreaks, one of 11 cases at Blackhorse Road
Girls' School in July and one of 8 cases at Coppermill Road Junior
Mixed School in December, both of the nasal type, were controlled
by repeated inspections and the swabbing of all suspects.