Seroprevalence of pertussis in China

Figures & data

Figure 1. The number of reported pertussis cases and pertussis vaccination coverage in Zhengzhou, 2001–2012 (A) and the whole of China, 1983–2012 (B).

Figure 2. Geometric mean titers of anti-PT and anti-FHA IgG by age group. The number in brackets represents the amount of subject at each age group.

Table 1. Distribution of anti-PT IgG titers by age group

Subgroup	No. of subjects	0–30 IU/mL		30–80 IU/mL		≥80 IU/mL
		n	(%)	n	(%)	n	(%)
<2	167	155	92.8	12	7.2	0	0.0
2–3 y	63	58	92.1	4	6.3	1	1.6
4–6 y	105	101	96.2	4	3.8	0	0.0
7–10 y	97	92	94.8	4	4.1	1	1.0
11–20 y	146	141	96.6	3	2.1	2	1.4
21–30 y	130	121	93.1	9	6.9	0	0.0
31–40 y	93	80	86.0	12	12.9	1	1.1
41–60 y	159	141	88.7	12	7.5	6	3.8
≥61 y	120	118	98.3	1	0.8	1	0.8
Total	1080	1007	93.2	61	5.7	12	1.1

Figure 3. The age-specific estimated incidence rates of B. pertussis infection per 100,000 population using different cut-off values. An asterisk symbol (*) indicates a statistically significant difference (P < 0.05).