Table 2. Reciprocal NtAb titers against homotypic and heterotypic pp in HCV genotype 1a infections.

	Patient H				Ch 1530
	Week 9	Year 2	Year 26	Ch1581, year 2	Week 21	Year 1	Year 3	Ch1422, year 18
ppH77(1a)	200	400	3,200	800	50	400	≈50	50
ppJ6CF(2a)	<50	≈50	100	<50	<50	<50	<50	<50
ppS52(3a)	<50	<50	<50	<50	<50	<50	<50	50
ppED43(4a)	<50	400	6,400	50	<50	100	50	<50
ppSA13(5a)	<50	800	6,400	200	<50	<50	<50	<50
ppHK(6a)	<50	800	6,400	200	<50	<50	<50	<50

Titers were determined by serial 2-fold dilutions of chimpanzee or human sera from genotype 1a infection and subsequent incubation with the indicated HCVpp. Values for neutralization of ppH77(1a) with sample collected from Ch 1530 at year 3 and cross-neutralization of ppJ6CF(2a) with sample collected from patient H at year 2 are indicated as ≈50 because it was repeatedly detected either slightly more or less than 50.