Staphylococcus

(staf"il-o-kok'kus) [G. staphyle, a bunch of grapes, + kokkos, a berry.] A genus or group of cocci in which the individuals are arranged in irregular ma es resembling somewhat bunches of grapes. S. ce'reus au'- reus, a species isolated from the nasal mucus in coryza; it forms a reddish orange pigment in cultures. S. ce'reus flavus, a species isolated from pus; it produces a yellow pigment in cultures. S. cit'reus, an occasional form, feebly if at all pathogenic, cultures of which on potato and agar give a lemon-yellow color. S. epider'midis alb us, an organism normally present in the skin, po ibly an attenuated form of S..pyogenes alb us. S. pllcat'ilis, a species regarded as pathogenic of perleche. S. pyog'enes alb us, a non-motile gram-positive form, causing suppuration, s. pyog'enes au'reus, a pus-producing form, occurring commonly on the skin, stab cultures of which in gelatin give a yellow precipitate. S. vir'idis flaves'cehs, a species isolated from the lesions of varicella which forms a greenish yellow pigment in cultures.