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spread to a second family, and after that further cases
occurred in the first, until 5 cases—spread over an
interval of one month—had been reported. In
another house, two cases were reported from the same
family, with an interval of two months. Here it was
ascertained that there had been cases of sore throat
among other inhabitants of the house, which throats
probably kept up a continuous personal infection. In
two instances there was reason to doubt the sufficiency
and efficiency of the disinfection carried out. In one
family, where the first case was kept at home, a second
occurred under circumstances very closely resembling
those associated with "return" cases.
There was no special incidence on any street in
the Southern District, nor is it necessary to enumerate
the streets in which more than three cases occurred,
as it was in every case possible to account for such
incidence.

Of the 11 instances in which more than one case
were reported for a single family, in 7 the primary
and secondary cases were reported simultaneously;