7 They found that 113 of 175 (64.6%) patients

transfused in the hospitals there had SGOT and SGPT elevations, but only 10 of 97 tested serially for icterus index (12 units corresponded to serum bilirubin 1.0 mg/dL) showed levels above 21 units that they considered icteric. Correspondence with Shimizu and close review of his published report disclosed that the Tokyo patients had received an average of 10.9 units of blood, each 200 mL in volume, whereas the Philadelphia patients received an average of only 2.1 units of 475 mL each (because of differences in blood banking practice at that time in the two countries). VX-809 datasheet Using a risk formula, R = 1 − (1 − c)n, where R was the risk of developing hepatitis (icteric or anicteric) after transfusions as a function of the carrier rate, c, for an infecting agent, and n was the number of blood units transfused, the carrier rates in both cities could be calculated from the observed rates of hepatitis. After discussion with Shimizu in Tokyo, we estimated9 that the risk per transfused unit was very similar in Tokyo

and at PGH: about 9.1% of the donor blood in both cities appeared to transmit at least anicteric hepatitis to recipients! Increased sensitivity to detect hepatitis by serum enzyme testing was recognized soon after publication of the rapid spectrophotometric method for measuring activities of SGOT and SGPT by Karmen.10 During his internship at HUP, Senior had selleck chemicals llc been much impressed by that technique and had carried out several hundred determinations of serum enzyme activities from patients with cardiac and hepatic diseases in 1955-1956, until testing was taken over by the Pepper Laboratory at HUP. In the mid-1960s, the U.S. incidence of post-transfusion hepatitis was controversial, estimates ranging

from as low as 1 per 10,000 units of blood transfused to more than 100 times that, depending on the sources of donor blood used, the population sample of recipients studied, and how hepatitis was detected.11 A large study at nine teaching hospitals in Boston during the period from 1952 through 1962 reported12 that of 303,000 units of whole blood transfused, only about 5 MCE or 6 per 10,000 appeared to cause jaundice or symptomatic hepatitis within 6 months. Unpublished reports from New Haven put the figure as low as 1 per 10,000. Was it 1 per 11, or was it a few per 10,000 transfused recipients? Quite independently, Dr. Baruch Blumberg moved in 1964 from the National Institutes of Health (NIH) to the Institute for Cancer Research (ICR) at Fox Chase, loosely affiliated with the University of Pennsylvania, to pursue his work on population genetics, looking for inherited serum polymorphisms indicating increased susceptibility to diseases such as leukemia, other cancers, and Down syndrome. He was joined there by Drs. Alton Sutnick and Thomas London. In July 1966, they studied a boy (J.B.