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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