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Table 3 The frequency of genes encoding the alpha (bca) and beta (bac) C protein, and the protein Rib (rib) among various GBS populations.

From: The frequency of genes encoding three putative group B streptococcal virulence factors among invasive and colonizing isolates

  alpha antigen ( bca ) ‡ beta antigen ( bac ) ‡ Rib protein ( rib )
GBS Collection Number screened n (%) Number screened n (%) Number screened n (%)
1. Sexually active college women with UTI and sex partner† 145 63 (43) 147 26 (18) 146 33 (23)
2. Sexually active college women without UTI and their sex partner 93 58 (62) 93 26 (28) 93 17 (18)
3. Infected newborns < 7 days of age 100 29 (29) 100 20 (20) 100 28 (28)
4. Random sample of college students† 53 25 (47) 53 18 (34) 53 13 (25)
5. Pregnant women 135 41 (30) 131 18 (14) 134 27 (20)
Total 526 216 (41) 524 108 (21) 526 118 (22)
  1. Note: n (%) represents the number of participants with the respective gene in each population; the number screened varies slightly by gene and population because a result could not be obtained for 4 strains tested for rib and bca, and 6 strains tested for bac despite repeated testing.
  2. †There was no difference in gene frequency by gender so the results were combined for presentation.
  3. ‡Using the Chi-square test, a significant difference at the p = .05 significance level was observed between bca frequencies in collection 2 versus 3 (p < .0001), 5 (p < .0001) and 1 (p = .004); and between bac frequencies in collection 2 versus 5 (p = .008).