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26
often very difficult to obtain an exact history of the commencement
of the illness, and it will therefore be better to take the date of
notification of the multiple cases and extend the period to one month
from the occurrence of a previous case in the house.
Multiple cases coming under the above head occurred in 43
houses. In each of 28 houses there were 2 cases, in 9 there were 3
each, in 5 there were 4 each, and in 2 houses there were 5 each.
Of the 28 houses where a second case occurred, in 12 instances
both notifications were received on the same day, in the others the
interval that elapsed between the receipt of the first and second
notifications was as follows:—
1 day 1 case
3 days 3 cases
4 ,, 3 ,,
5 „ 1 case
6 1 „
8 days 2 cases
11 „ 1 case
12 ,, 2 cases
14 „ 1 case
20 ,, 1 ,,
With three exceptions, the cases were removed to the Hospital
on the date of the receipt of the notification. The three exceptions
were nursed at home ; in one of these the two notifications were
received on the same day, and in the two others an interval of 8 days
elapsed between the receipt of the first and second notification.
In the 9 instances where 3 cases had occurred in each house, in
one of them the 3 notifications were received on the same day, in 4
the first and second notifications were received on the same day,
followed by the third at intervals of 5, 8, n and 11 days respectively.
In one instance the second and third were received on the same day,
11 days after the receipt of the first.
The intervals between the three notifications in the others were
as follows:—
1. Between 1st and 2nd—11 days. 2nd and 3rd—2 days.
2. ,, ,, ,, „ 11 ,, ,, ,,,, 4,,
3. ,, ,, ,, ,, 13 ,, ,, ,, ,, 2 ,,
In one instance the children were nursed at home ; the first and
second notifications were received on the same day and the third
after an interval of 11 days.
In 2 of the instances where four cases occurred, all notifications