Harris County Population at risk - 22237304 Cases - 77228 Crude rate - 347.3 Age-adjusted rate - 400.1 95% CI - 397.2 95% CI - 403.1 Bell County Population at risk - 1659684 Cases - 6733 Crude rate - 405.7 Age-adjusted rate - 480.8 95% CI - 469.1 95% CI - 492.6 Foard County Population at risk - 6315 Cases - 42 Crude Rate - 665.1 Age-adjusted rate - 404.9 95% CI - 280.4 95% CI - 573.7 Note: All rates are per 100,000. Rates are age-adjusted to the 2000 U.S. Standard Population. Calculate the prevalence rate per 100,000 for these counties