Exanthemata

Exanthemata (from a Greek verb, 'to effloresce,' or come out in a rash), a class of febrile diseases (see FEVER) attended by distinctive eruptions on the skin, appearing at a definite period, and running a recognisable course. To this class belong smallpox, chicken-pox, measles, scarlet fever, and, according to some authorities, plague, typhus, &c.