TABLE 1.

Comparison of results for direct CNA blood agar culture, SSB enrichment with CNA subculture, and SSB enrichment with StrepB Select subculture for detection of GBSe

ConditionNo. (%) of samples positive for GBS
Preenrichment (CNA direct; 24 h)a201 (82.7)
Postenrichment
    CNA (24 h)b224 (92.2)
    StrepB Select
        24 hc240 (98.8)
        48 hd241 (99.2)
  • a Swabs inoculated directly onto colistin-nalidixic acid blood agar (CNA).

  • b Postenrichment with Streptococcus selective broth followed by inoculation onto colistin-nalidixic acid blood agar and incubated for 24 h.

  • c Postenrichment with Streptococcus selective broth followed by inoculation onto StrepB Select agar and incubated for 24 h.

  • d Postenrichment StrepB Select agar incubated for 48 h.

  • e The total number of GBS-positive specimens was 243.