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traceable to school contact constituted only 1.6 per cent, of all
the cases.
It is noticeable this year that a larger percentage than last,
namely, 22.2 per cent., as compared with 10.7 per cent, of primary
ases, have occurred among young children not attending school.
This is to be expected in a non-epidemic year. The cause of
the constantly-recurring epidemics of measles is the aggregation
of susceptible children in the infants' departments. When it
does not spread by this means there is a greater relative primary
incidence upon children not attending school, but the proportions
of the epidemic are greatly reduced.
Whooping Cough.
Whooping cough accounted for precisely the same number
of deaths as measles, namely, 25. With the exception of a little
outbreak in June, a few cases only of whooping cough were
regularly notified from the schools each week until November.
From November until the end of the year a considerable
accession of cases occurred. 34.7 per cent. of all the cases were
primary cases contracted by school contact in the Infants'
Departments.
11.4 per cent. were primary cases attending the Infants'
Departments, believed to have contracted the disease otherwise
than by school contact.
Primary cases in the Boys', Girls' and Mixed Departments
contracting the disease by school contact accounted for only
1.7 per cent, of all the cases, while primary cases occurred in 13.6
per cent, of the total, among children not attending school at all.