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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).