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The increase in 1902 is accounted for by the fact that
chicken-pox was very prevalent in that year, and had been
temporarily added to the list of notifiable diseases on account
of the outbreak of small-pox in that year.
It should be noted that these fees are returned to the
Sanitary Authorities by the Metropolitan Asylums Board.
The chart inserted gives a graphic representation of the
course of the rise and fall of infectious disease. This studied
in connection with the tables on pages 66 and 67 is interesting, as
showing the seasonal and other fluctuations peculiar to the
incidence of infectious disease.
There was a marked increase in the number of notifications
of diphtheria received during 1907, i.e. 32.8 per cent, higher
than the average for the five years 1901-05, but 36.4 per cent,
lower than the average for the ten years 1891-00. The 315
diphtheria cases occurred in 281 infected houses, and in only
34 of these were the drains on testing found defective.
The scarlet fever notifications were 5.9 below the average
of the Borough statistics for the ten years 1891-00. The 922
cases occurred in 722 infected houses, and in 108 of these
sanitary defects were found.
The enteric fever (or typhoid) notifications received were
27.9 per cent, below the average for the ten years and represent
30 infected houses, 22.2 per cent, of the drains of which
were, on testing, found to be defective.