Streptococcus facultatively anaerobic or microaerophilic, catalase negative, gram-positive Cell arranges in pairs or chains, usually nonmotile, A few species are anaerobic rather than facultativeStreptococcus - facultatively anaerobic or microaerophilic, catalase negative, gram-positive, Cell arranges in pairs or chains, usually nonmotile, A few species are anaerobic rather than facultative