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An outbreak of hepatitis in plasma donors occurred in a village of Hebei Province in the period of September to October 1985. The morbidity rate was 40.0% (26/65) in the plasma donors, which was significantly higher than that in whole blood donors (1/88) and in persons who were not blood donors (1/400). One to one paired survey was carried out, and the incidence was 46.4% (26/56) in the plasma donors, while there were no such outbreak in the control group. The distribution of cases showed positive correlation with the number of plasma donors from the production brigade. No secondary infection was found in their families. The peak of outbreak was about 2 months later than the peak of plasma donation. 26 cases of hepatitis in plasma donors all showed negative results for anti-HAV IgM, HBsAg, anti-HBC IgM, anti-CMV IgM and anti-EBV IgM. Sera of 25 cases were selected and sent to CDC, USA to confirm with Chiron C100 reagent. 24 cases were anti-HCV positive. This outbreak of hepatitis was demonstrated to be related to cross contamination during plasma donation.
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