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67
Case Mortality.—The case mortality of the various
notifiable infectious diseases is represented by the percentage of
fatal cases to the number of persons attacked at all ages.
Scarlet Fever.—2.17 per cent. of the cases proved fatal,
compared with 2.4 per cent. in 1903.
Diphtheria.—Although the notified cases (130) showed a
considerable decrease (over 250) for the year 1903, the disease
assumed a more fatal type, giving a mortality of 11.1 per cent.
compared with 8 per cent. in 1903.
Attack Rates represent the number of cases occuring to
every 1,000 persons living at all ages. These rates are useful
for comparison with other Boroughs in regard to the incidence of
infectious diseases. (See Table 21).
The attack rate from all notifiable diseases for the whole
Borough during the year (excluding Chicken-pox) amounted to
3*93 per 1,000 of the population, compared with 6.09 in 1903,
and 9.68 in 1902. The attack rate for the County of London
was 6.08. The attack rates for the Wards will be found in
Table 21. The Ward having the greatest number of cases in
relation to its population was Brockley, with 5.53 per 1,000, and
the lowest attack rate was in Church Ward, 2.08 per 1,000.