Table 1.

Comparison of GBS culture detection methods with vaginal and vaginoanorectal samples from 1,250 pregnant women

Specimen type (total no. of specimens)No. of positive cultures detected (relative sensitivity [%] vs all methods)
Direct inoculation in GMSubculture from selective broth onto:All methods
Plates anaerobiosisPlates with cover slide, aerobiosisTubesBlood agar platesGM plates, anaerobiosisGM tubes
vaginal
 First phase (400)52 (93) NDa ND54 (96)54 (96)ND56 (100)
 Second phase (400)NDND50 (96)52 (100)52 (100)ND52 (100)
Vaginoanorectal (450)85 (96)85 (96)85 (96)73 (82)79 (89)79 (89)89 (100)
  • a ND, not done.