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233
The percentage incidence is calculated on the average school
population over the year at each school.
Waddon showed the highest incidence (78%) of all infectious
diseases; this was due to a number of cases of Mumps, Measles,
and Chicken Pox. Next came Oval with 62.0%, due to the same
causes, then St. Andrew's (50%), Davidson (41%), Christ Church
(33%) and Ashburton (33%). The lowest incidence was found in
Croydon British, Gonville, St. Saviour's, South Norwood, Purley
Oaks, Portland and North Park.
The foregoing table shows that there was a heavy incidence
of measles at Waddon (192), Winterbourne (153), West Thornton
(136), and Ecclesbourne (119). These schools, as might be
expected, differ from those in which the incidence was heaviest
in 1929.
There was a somewhat heavy incidence of chicken pox in
Waddon (97), Winterbourne (95), and West Thornton (88).
Whooping Cough was conspicuous in West Thornton (52)
and Waddon (31).
Scarlet Fever showed its heaviest incidence in Winterbourne
(39), Waddon (34), West Thornton (24), and Davidson (20).
Diphtheria was heaviest in Rectory Manor (35), Rockmount (29),
Ingram (21), and Ecclesbourne (17).
Measles was most prevalent during the first half of the year.
Scarlet Fever maintained a uniform incidence throughout the
year. Diphtheria showed an average of some 8 cases a week with
a small exacerbation during October and the first half of November.
Whooping Cough was not very troublesome until December,
when the number of cases rose. Chicken Pox was prevalent
throughout the first five months of the year, with an increase at
the beginning of December. Mumps was prevalent during the
first six months of the year, but died away during the second half.
Schick Testing and Immunisation Against Diphtheria.
During 1930 the department has been called upon to carry
out this procedure in four residential institutions within the
Borough. In a few cases it has also been done at the request of
parents anxious to protect their children against Diphtheria. A
brief description of the procedure was given in my report for 1929.