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The following Chart I shows graphically the number of cases of
enteric fever notified in the Borough from the beginning of the year
up to the week ending August 29th.
For comparison with the above, I give here Chart II showing the
average number of cases of enteric fever notified weekly during the
ten years 1892 to 1901. It will be seen from this that the rises
indicated in the chart 1903 are quite abnormal:—
Localisation of the Disease.—It will be seen from chart I.
that the outbreak took the form of two waves or outbursts; the first
extending from the second week in June to the week ending the 25th
of July, and the second from the first week in August to the week
ending the 29th of August; both of these outbursts showing a
different localisation. These outbursts may be distinguished for the
purposes of this report, the first by the letter A, the second by the
letter B.
Outburst A, which consisted of 48 notified cases extending over a
period of eight weeks, were almost all located within an area represented
by a circle of one-third mile radius, the centre of the circle
being situated in the Clarence Road, opposite Pembury Grove.
Outburst B, which consisted of 62 notified cases extending over a
period of nine weeks, were scattered over a larger area, but were
mostly located within a space represented by a circle of half-mile
radius, whose centre was situated near Orchard Street, adjoining
Well Street. A large number of these cases invaded area A.