title: Effect of pyridoxal on growth of nutritionally variant streptococci and other bacteria on sheep blood agar.
abstract: Supplementation of sheep blood agar with pyridoxal hydrochloride or pyridoxamine dihydrochloride aided recovery of nutritionally variant streptococci; however, it was found to prevent recovery of 6 of 173 (3%) primary isolates of Streptococcus pyogenes and to adversely affect laboratory recognition of other streptococci. Pyridoxal hydrochloride or pyridoxamine dihydrochloride should not be a routine supplement in all sheep blood agar.
mesh_terms: D000362:Agar; D000818:Animals; D001769:Blood; D011730:Pyridoxal / Q000494:pharmacology*; D011733:Pyridoxamine / Q000494:pharmacology*; D012756:Sheep; D013291:Streptococcus / Q000187:drug effects / Q000254:growth & development*
chemical_list: D011730:Pyridoxal; D011733:Pyridoxamine; D000362:Agar