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61
148, W-Road (corner of F-
Street
36,C-Street
45, C-Street
7, S-Street 1 each
Secondary cases arise in infected houses at the end of the
known incubation period of the disease (two to three weeks),
and are due to infection from previous patients before they are
removed to Hospital and properly isolated, and before the disinfection
of the premises has been carried out. It follows, as a
natural corollary, that the sooner typhoid cases are removed from
crowded houses, the less chance there is of these so-called
secondary cases occurring. The large number met with in the
present outbreak is due to the fact that cases of typhoid were undiagnosed,
and left in crowded centres for longer or shorter intervals
(e.g., one to four weeks), during which infection spread
from person to person, not) only in the same house, but also in
neighbouring houses. A startling example of this is to be found
in the series of thirteen cases met with at 8, 35, and 53, F. Street,
and which are supposed (as already stated) to have arisen from
Clara B., at 8, F. Street, thus: —