Persistence of hepatitis B vaccine immune protection and response to hepatitis B booster immunization

Table 1 Positive rates for anti-HBs, anti-HBc and HBsAg of 1018 children aged 1-7 years after infancy hepatitis B immunization in Longan County in 1994

Age group (yr)	No. of subjects	Anti-HBs (≥ 10S/N)		Anti-HBc (≥ 75%)		HBsAg (≥ 2.1S/N)
		n	%	n	%	n	%
1-2	220	165	75.0	1	0.5	2	0.9
3-4	341	178	52.2	13	3.8	9	2.6
5-6	320	144	45.0	8	2.5	7	2.2
7	137	66	48.2	8	5.8	1	0.7
Total	1018	553	54.3	30	3.0	19	1.9