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As is to be expected, where a definite history of exposure to
infection can be obtained, it is a member of the same family who
is the source of infection. In all but 13 of the 67 cases tabulated
the infecting person was a member of the family.
Housing conditions in Hornsey are, on the whole, very good,
and there was little fault to find in most cases with the living
conditions of the patients. It is not probable that these conditions
had much influence on the disease. There were 28 premises in
which conditions more or less insanitary were found—chiefly want
of cleanliness or dampness. In these cases steps were taken to get
the insanitary conditions remedied or removed.
Of the 187 Tuberculous patients visited, 132 were resident in
Hornsey at the time of the apparent onset of the illness. In 16
cases the patients complained that their work-places were not in
a satisfactory condition. The complaints referred chiefly to want
of light and ventilation.
There were 65 patients who at the time of notification were
known to have Tubercle bacilli in the sputum, in 65 cases no
examination of the sputum had been made, and in the remaining
6 cases no bacilli had been found on examination of the sputum.