TABLE 4.

Age-Specific Percentage of Symptomatic (HFMD/Herpangina) Infection Among EV71-Seropositive Children

Age in Years During Blood Sampling (Age During the Epidemic)Percentage of Children With Symptomatic Infection*
0.5–0.9 (<0.5)14% (3/22)
1–1.9 (0.5–1.4)40% (25/63)
2–2.9 (1.5–2.4)41% (36/87)
3–3.9 (2.5–3.4)33% (20/61)
4–4.9 (3.5–4.4)29% (22/76)
5–5.9 (4.5–5.4)19% (34/175)
0.5–5.9 (<5.5)29% (140/484)
  • * Number in parentheses is number of EV71-seropositive children with HFMD/HA divided by total number of EV71-seropositive children.

  • χ2 = 10.49; P = .001 with Pearson χ2 test.