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30
VACCINATION
743 persons received primary vaccination and 187 re-vaccination.
POLIOMYELITIS AND ACUTE ENCEPHALITIS.
During the course of the year three cases of poliomyelitis
occurred in the District, and were of a mild type. Two of the cases
were boys, aged 5 and 7 years, and the third was a girl of 1 year.
The first case to be notified during the year occurred in July.
No further case occurred until the end of October followed by
another one in December. No evidence of association between
cases could be found, and none of the cases proved fatal.
FOOD POISONING
Sixteen cases of food poisoning were notified during the year,
of which 8 were single cases. 3 cases were notified in each of two
households, and two in another.
Of the 16 cases, 12 were due to "Salmonella Typhi-murium,"
and in the remaining 4 no agent was identified.
SONNE DYSENTERY
The incidence of mild dysentery due to Shigella Sonnei, showed
an increase of 3 cases on last year's figure of 164. It is believed that
the spread of infection was reduced to some extent, by the steps
taken to exclude contacts from Day Nurseries, Schools and certain
occupations, and by the intensive search for contacts, followed by
bacteriological investigation, and control of those found to be
positive, but it put a considerable strain on the Department and
the Laboratory.