Table 1.

Seroconversion to positivity for hepatitis C antibody among repeat donors in England, 1993-5

	1993	1994	1995	1993-5
No of donations from donors who had seroconverted since previous donation	5	3	6	14
No of donations from repeat donors tested for antibody to hepatitis C virus	2 140 712	2 116 178	2 105 038	6 361 928
Frequency of donations from donors who had seroconverted since previous donation	1 in 428 142	1 in 705 393	1 in 350 840	1 in 454 423
Rate of seroconversion per 100 000 person years (95% CI)	0.40 (0.17 to 0.96)	0.24 (0.08 to 0.75)	0.49 (0.22 to 1.08)	0.26 (0.15 to 0.43)