Table 1.

Age-specific proportion of the population susceptible to symptomatic SARS-CoV-2 infection on April 10, June 1, and August 1, 2022. The values in V and V + I represent the proportion of the population that is susceptible to symptomatic infection with the Omicron variant, considering immunity solely from vaccination (V) and immunity from both vaccination and natural infection (V + I), respectively. The projection was performed on April 10, 2022, and the estimates afterward are from a model-based projection. Numbers in parentheses show the 95% confidence intervals (CIs) as computed by the parametric bootstrap method.

	2022/4/10		2022/6/1		2022/8/1
Age group	V (95% CI)	V + I (95% CI)	V (95% CI)	V + I (95% CI)	V (95% CI)	V + I (95% CI)
20–29	79.0 (78.6–79.4)	55.6 (55.2–56.0)	65.7 (65.3–66.1)	47.7 (47.3–48.1)	65.5 (64.9–66.2)	52.3 (51.6–52.9)
30–39	78.9 (78.5–79.2)	59.7 (59.3–60.1)	65.9 (65.5–66.3)	51.2 (50.8–51.6)	66.0 (65.4–66.7)	55.2 (54.5–55.9)
40–49	73.8 (73.4–74.1)	59.2 (58.8–59.6)	60.5 (60.1–61.0)	49.3 (48.9–49.8)	65.6 (64.9–66.4)	57.4 (56.6–58.2)
50–59	63.7 (63.2–64.1)	53.9 (53.5–54.3)	63.2 (62.7–63.8)	55.7 (55.2–56.3)	73.2 (72.4–74.0)	57.7 (57.3–58.9)
60–69	54.9 (54.5–55.4)	49.4 (48.9–49.9)	64.8 (64.2–65.5)	60.5 (59.9–61.3)	74.9 (74.0–75.8)	68.2 (66.8–68.5)
≥70	51.4 (50.9–51.9)	47.0 (46.5–47.5)	63.3 (62.4–64.1)	59.8 (59.0–60.7)	73.6 (72.5–74.6)	71.1 (70.0–72.1)