Streptococci as urinary pathogens.

In a 2-month prospective study of streptococci isolated from urine specimens in the laboratory, 242 strains of catalase-negative gram-positive cocci or coccobacilli were isolated in substantial numbers from 11,725 specimens. These comprised 10% of the important isolates. Species identification of all isolates was undertaken. 74 (30%) of the isolates were of species other than Streptococcus faecalis and S agalactiae. 79 (33%) were not detected on cysteine-lactose-electrolyte-deficient agar after overnight incubation in a carbon dioxide incubator. 20 of the 24 isolates of coccobacilli were Gardnerella vaginalis. Many of the isolates of fastidious species were accompanied by pyuria. An isolation protocol practicable in busy laboratories is proposed.