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52
SECTION IV.
PREVALENCE AND CONTROL OF INFECTIOUS DISEASE,
Table I. gives the figures for ages and Wards.
Scarlet Fever was less prevalent than in 1935; the largest
incidence has been in West Thornton, Waddon, and Norbury
Wards. Based on the estimated ward populations, the case rate
for these wards was respectively 520, 356, and 465 per 100,000
of the population. The age group 6-15 years, as usual, suffered
most; cases in this group comprising 54.8 per cent. of the total.
Diphtheria was also less prevalent than in 1935; most cases
occurred in Waddon (36) and West Thornton (27). Once again
the age group 5-15 years gives the highest figures, constituting
53 per cent, of the total.
No cases of Small Pox occurred during the year.
There were 14 cases of Puerperal Fever and 48 of Puerperal
Pyrexia; 28 occurred in the age group 16-25 years and 34 in the
age group 26-45 years. A majority of the cases occurred in women
having their first confinement.
The incidence of the commoner infectious diseases in Croydon
during the past thirteen years is of interest.
Scarlet Fever has shown a succession of shallow waves of
incidence with a distinct trend towards an aggregate increase.
The periods of maximum intensity have been in 1924, June and
July; 1925, March, April and May; 1926, May, June and July;
1927, April, May and June; 1928, January and February, with
another in November and December; 1929, a gradual increase
throughout the year without any intermissions. 1930 and
the incidence was relatively constant, with a slight decline in the
number of cases in August and September. During 1932 there
was a steady increase in cases until the begininng of May, when
the incidence fell rapidly and remained low until the beginning
of a new wave in November. Tn 1933 the incidence remained
fairly steady throughout the year. In 1934 there were two peaks
of incidence, the first and smaller came in the second week in