Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Westminster, City of]
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Deaths Black.
Recoveries White.
The two upper figures represent the mildness or severity of the cases,
the white squares representing mild attacks, the shaded more serious, and
the black the worst type.
The two lower figures show the percentage of recoveries and deaths.