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46
an incubation period of a fortnight. One case was fairly
definite as to the infection being probably derived from a
village water supply. Another was almost certainly infected
from polluted ice cream, as there had been other cases in the
district visited derived from this source. A third had partaken
freely of shellfish whilst on a visit, and this may or
may not have been polluted. The other cases seemed to arise
without any possibility of tracing the source of infection. In
one house, two other inmates were infected before the
original case was clearly diagnosed. The symptoms in this
original case were so slight and indefinite that there seemed
no sufficient ground for diagnosing it as Enteric Fever until
the other two cases occurred.

It is an interesting point as to how much the reduction
of bacterial diseases is due to administrative action and how
much to climatic conditions.