A distinct rigor or shivering fit then
takes place, accompanied by pain in the back or in the stomach, with
sickness, giddiness, or headach; as also great drowsiness. And if an
infant be the subject of the disease, a convulsive fit will sometimes
take place, or several in succession.
At the end of eight-and-forty hours from the occurrence of the rigor
(in the majority of cases), the eruption comes out; and shows itself
first on the face and neck in minute flea-bite spots. In the course of
the next four-and-twenty hours in some cases, and in others not until
the expiration of two or three days, it completely covers the body; not
being confined exclusively to the skin, but frequently extending to the
mouth and throat, and even to the external membrane of the eye.
In the course of two or three days from their first appearance the
little pimples, increasing in size, will be found to contain a thin
transparent fluid, to pit or become depressed in their centre, and the
skin in the spaces between them will be found red. On the seventh or
eighth day from the commencement of the fever, the fluid contained in
the pimples will be no longer transparent, but opaque; and they will
consequently appear white, or of a light straw colour. Each pimple or
pock will be no longer depressed in its centre, but will become raised
and pointed, being more fully distended by the increased quantity of
fluid within; and the skin around each pock will now be of a bright
crimson.
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