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Chimpanzees were used to determine the ability of prior freezing of red blood cells to prevent the transmission of Type B post-transfusion hepatitis. Four units of human whole blood were each inoculated with 10(6) infectious doses of hepatitis B virus. Although all units became HBsAg negative after freezing and deglycerolization, hepatitis B virus infection developed in all four chimpanzees when these units were transfused. Two of these chimpanzees had only serologic evidence of infection, including the development of HBsAg and antibody to both the hepatitis B surface and core antigens; in these animals, the incubation periods were prolonged (24 to 25 weeks). In contrast, the other two animals also had elevated serum glutamic pyruvic transaminase (peaks of 190 and 461 IU per liter) and had a more rapid onset. There was no hepatitis B virus infection in two nontransfused controls. Our results do not support the use of frozen red blood cells for the prevention of post-transfusion hepatitis.
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