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49
Sub Registration Districts.
East
Battersea
Nth.-West
Battersea.
Sth.-West
Battersea.
Borough.
No. of Cases 150 112 63 325
Case-rate per 1,000 population
21 23 13 193
No. of Deaths 3 — 1 4
Death-rate per 1,000
population 0.04 0.00 0.02 0.02
Case-mortality per cent. 2.0 0.00 1.58 1.23
Of the 325 cases of Scarlet fever notified 198 (i.e., 61 per cent.)
were of children of school age.
In 39 of the houses invaded, multiple cases occurred as follows:
No. of times.
5 cases in one house 1
4 „ „ 2
3 „ „ 8
2 „ „ 28
In other words 93 cases of scarlet fever occurred in 39 houses,
two or more members of the same family or persons living in the
same house being infected. In most cases the source of infection
was traceable to the presence of a mild unrecognised case or to
some suspicious illness from which one or more members of the
family or families residing in the house was suffering.
The percentage of so-called return cases to total cases was
slightly higher during 1911 than in the previous year. The following
table gives the numbers and percentages to total cases of " return
cases " of scarlet fever since 1905:—
Total cases. "Return" cases. Per cent.
1905 801 23 2.87
1906 1,011 34 3.36
1907 922 47 5.09
1908 1,099 52 4.73
1909 702 45 6.41
1910 439 20 4.55
1911 325 16 4.92
The number of cases sent back from hospital notified as scarlet
fever and in which the diagnosis was found to be erroneous was 27
or 8 per cent., as compared with 10 per cent. in 1910.