Serum hepatitis had practically been diagnosed by manifested jaundice, which appeared 2 to 6 months after blood transfusion, while recently it has become clear that there are so many cases without jaundice, though they have hepatic changes probably due to hepatitic virus. Detection of such cases is to be relied upon. BSP test or serum transaminase activity and histological findings of liver biopsy specimen. On this occasion, however, it must be most careful that toxic liver injury or hepatic alterations following surgical operation are to be distinguished from serum hepatitis, because they had all primary disease for which surgical operation or some drugs had been applied.
The present study was performed to obtain accurate criteria for the diagnosis of serum hepatitis, at the present period having no procedures of detecting hepatitic virus.
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