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Table 2 Estimated HBsAg prevalence and estimated number of HBsAg-positive cases in the San Francisco Bay area

From: Racial/ethnic- and county-specific prevalence of chronic hepatitis B and its burden in California

Age Group (Years)

Populationa (2015)

HBsAg-positive cases (range)

HBsAg-prevalence (range)

0–19

2,202,500

2607 (1474–5577)

0.12% (0.07–0.25%)

20–29

1,254,437

11,106 (6113–18,053)

0.89% (0.49–1.44%)

30–39

1,311,988

24,436(16,842–33,961)

1.86% (1.28–2.59%)

40–49

1,230,512

25,627 (19,102–33,946)

2.08% (1.55–2.76%)

50–59

1,192,159

19,120 (14,218–25,231)

1.60% (1.19–2.12%)

60–69

898,217

12,940 (8709–19,866)

1.44% (0.97–2.21%)

70–79

473,888

6117 (3455–10,572)

1.29% (0.73–2.23%)

80+

310,260

2781 (1039–6393)

0.90% (0.34–2.06%)

Total

8,873,961

104,734 (70,952–153,598)

1.18% (0.80–1.73%)

  1. aTotal population year 2015, counties: San Francisco, Santa Clara, Alameda, San Mateo, Contra Costa, San Joaquin, Merced, Monterey, Stanislaus, Marin, Santa Cruz and San Benito
  2. HBsAg hepatitis B surface antigen