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96
While the incubation period of 12 days was by far the most common,
there would appear to be cases in which this time was prolonged.
The commonest initial symptoms, given in order of their frequency,
were:—
Headache, Feverishness, Backache, Giddiness, Pains in Limbs.
There appeared to be no very definite relationship between the
severity of the initial symptoms and the amount of the rash; in fact,
in one or two cases in which the rash was fairly profuse, the patients
(children) gave no history of illness at all.
The average interval between the onset of illness and the appearance
of the rash was 3 days. In the great majority of cases the rash appeared
on the second or third day, but cases have been examined daily in which
the rash did not appear until the fourth or fifth day. When, however,
the rash did appear, it tended to mature rapidly.
The diseases seen when visiting suspected Smallpox cases have been:—
Chickenpox, Measles, German Measles, Scabies, Impetiginous
Eruptions, Drag and Serum Rashes, Acne and other skin conditions.
In young babies, a papulo-vesicular eruption, mainly on the limbs
and generally accompanied by gastro-intestinal disturbance and associated
with teething, has been noted in several instances.
SOURCE OF INFECTION.
As mentioned in last year's Report, the mildness of the type of
infection rendered the tracing of the sources of infection very difficult;
in some instances the primary case in a house only being discovered
when the contacts were examined.
157 NOTIFIED CASES.
"Missed" case in house
(Not notified—noninfectious
when
discovered).
Primary case in house.
Subsequent cases
associated with
primary cases.
Not
traced.
Other cases
in immediate
neighbourhood.
Probably
Imported.
In
same
house.
Elsewhere
in Borough.
16
22
6
30
54
45