Note again the particular points that help to differentiate smallpox from chickenpox:
– in smallpox, the fever precedes the rash by 2 to 4 days,
– the pocks on any part of the body are at the same stage of development, and they develop slowly,
– the pocks are more numerous on the arms and legs than on the body,
– the pocks are usually present on the palms and soles,
– death following smallpox is not uncommon, while in chickenpox death is very rare.
When death occurs in a patient in whom chickenpox has been diagnosed, smallpox should always be suspected.

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