. A practical treatise on medical diagnosis for students and physicians . cella is one of the infections of childhood in which the feveris very mild and may not attract attention. It is an acute, specific,infectious fever, occurring almost exclusively in children, and character-ized by the appearance, in successive crops, of colorless or pearly vesi-cles which dry up and are shed in from two to five days. It is attendedwith very little constitutional disturbance. A second attack is extremelyrare. Incubation. The incubation is generally about two weeks, but maybe one or three weeks. In ordinary
. A practical treatise on medical diagnosis for students and physicians . cella is one of the infections of childhood in which the feveris very mild and may not attract attention. It is an acute, specific,infectious fever, occurring almost exclusively in children, and character-ized by the appearance, in successive crops, of colorless or pearly vesi-cles which dry up and are shed in from two to five days. It is attendedwith very little constitutional disturbance. A second attack is extremelyrare. Incubation. The incubation is generally about two weeks, but maybe one or three weeks. In ordinary cases the first evidence of the inva-sion of the disease is the appearance of the eruption. In other cases,the severer ones, the child may be noticed for some hours or several daysto be indisposed, and complain of loss of appetite, nausea, headache, andvague muscular pains. The fever is almost always moderate—100° to101° F. Eruption. The eruption consists first of hyperaemic macules, com-pared by Trousseau to the rose-rash of typhoid fever. These macules Fig. Varicella on the fifth day of eruption. (Welch.) rapidly become first papules and then vesicles. The papules are not hardas in variola. They appear at first upon the chest, neck, face, and scalp,then upon the trunk and limbs. The development of the vesicles is sorapid that the eruption appears vesicular from the start. The vesiclesvary in size from that of a pinhead to that of a small pea. They arevery superficial, and usually rest u]>on a base that is slightly or not at SCARLET FEVER. 709 all hypergemic. The contents are at first watery, and subsequentlybecome pearly. The reaction of the Huid is alkaline. Distinct umbili-cation is rare, and pu>tulation still more rare, but both occur. Thevesicles almost ahvays dry up and form yellowish or brownish scabs,which drop off, leaving a slightly reddened, sometimes depressed the vesicles are to be seen upon the buccal mucous mem-brane and upon the
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