variola

(var-i’o-lah) [1,1. Small-pox; an acute infectious disease characterized by vomiting, lumbar pains, an eruption which is first papular, then vesicular, and finally pustular, and by fever which is marked by a distinct remi ion, beginning with the eruption and continuing until the latter becomes pustular. The disease is thought to be due to a protozoin, the Cytorrhyctes variole. The period of inoculation is about twelve days, and the eruption consists in infiltration of cells into the skin, which cells undergo liquefaction, with the production of suppuration. The eruption begins about the third or fourth day, with the formation of small red spots on the forehead, face, and wrists. These change into smooth, round papules, which feel like shot under the skin. This eruption spreads over the body, and about the third day the papules become converted into vesicles with a depre ion or umbilication at the top. The vesicles gradually become converted into pustules, which increase in size and dry up and break, forming soft, yellow crusts, which have a_ peculiar offensive odor. After a week the scabs fall off, leaving pitted scars or pock-marks. black v. Same as hemorrhagic tv. bovine v. Same as vaccinia. coherent v., a kind in which the pustules cohere at the edges, but do not become confluent. confluent v., a severe form in which the pustules become more or le confluent. Υ͂. crystalli’na, chicken-pox. discrete v., a form in which the pustules remain more or le distinct. equine v. See cquinis. hemorrhagic v., a form in which hemorrhage occurs into the vesicles or from the mucous surfaces. v. inser’ta, smallpox acquired by inoculation. mal: tv., a severe and very fatal form of hemorrhagic variola. v. milia’ris, small-pox with an eruption of small vesicles. modified v. Same as varioloid. ovine v., ovinia: the small-pox of sheep. v. pemphigo'sa, small-pox with an eruption of large lebs. v. siliquo’sa, small-pox in which the contents of the pustules becomes absorbed, leaving the walls empty. v. ve’ra, simple and unmodified small-pox. V. Verruco’sa, wart-pox, a variety in which the eruption does not pa beyond the papular stage.