Table 1. The rate of pertussis infection by age group in Zhejiang Province, China, 2014.

Agegroup	No. of subjects	≥80 FDA-U/ml
		n	Percent(%)
3 y	185	7	3.78
4–5 y	205	8	3.90
6–7 y	190	15	7.89
8–10 y	195	18	9.23
11–15 y	184	26	14.13
16–25 y	189	23	12.17
26–35 y	181	19	10.50
36–59 y	192	22	11.46
≥60 y	186	31	16.67
Total	1707	169	9.90