View report page

54
November and December, then rose steadily to the highest level
of the period under review in January, 1929, from when it fell
steadily to the end of the year. Throughout 1930 it remained
quite inconspicuous, until December, when there were indications
of the commencement of a wave of increased incidence which persisted
in 1931 until the end of July, after which the number of
cases dropped considerably. December showed a small rise in
cases. A wave of increased incidence occurred in 1932, commencing
the second week in April and persisting until the end of
July. Two small waves showed themselves during 1933, the first
commencing early in February and persisting until the beginning
of August; the second beginning in late October and continuing
until the end of the year. In 1934 two waves were also experienced
; the first with its peak at the end of January, and the
second with its peak at the middle of April. From then a
moderate incidence was present until the beginning of August,
when the numbers dropped rapidly, the incidence remaining very
low for the rest of the year. In 1935 the incidence of Whooping
Cough rose in a series of sharp waves throughout the year. In
1936, this zymotic maintained an average of some 20 cases brought
to the notice of the Department each week. There was a slight
decline in incidence towards the end of the year.
Measles was very prevalent in April and May, 1924, then
dropped suddenly, but showed a small rebound during September,
October and November, after when it died away until a
sudden rise in May, June and July, 1925, and was followed, after
a fall, by a further and more prolonged rise from October, 192-5,
to May, 1926. During 1927 there was very little Measles in
Croydon; a small rise in October, November and December,
however, heralded a very big incidence of cases—the highest
during the period under review—during the first six months of
1928, Practically no cases occurred after this exacerbation, until
March, 1929, but during this month, and April, May and June,
1929, a number of cases occurred from when the incidence dropped
awav until the end of the year. Another wave of considerable
intensity commenced abruptly during the last week of February,
1930, reaching its maximum in the second week of March and
dying away gradually until terminating at the end of June.
During 1931, Measles was quite inconspicuous; but in 1932 there
was a sharp rise in cases in the second week in April which readied
a maximum in the last week in June, falling then rapidly. The
beginning of another wave showed itself at the end of November
and the cases were steadily increasing in number for the rest of