“…However, the tests most often used to demonstrate impaired liver function, the thymol turbidity and the cephalin-cholesterol flocculation, are those which reflect alterations in serum proteins, alterations for which antibody production might be in part responsible; caution has therefore been exercised in regarding abnormal flocculation tests as evidence of liver damage. Nevertheless, Leibowitz (1953) in a review of clinical, chemical, biopsy, and post-mortem studies concluded that hepatitis was an integral feature of most, if not at all, cases of infectious mononucleosis, a conclusion confirmed by the almost invariable finding of inflammatory changes in the liver in the biopsy studies of Nelson and Darragh (1956) and Sullivan et al (1957). Wr6blewski and LaDue (1956) have shown that the levels of the serum glutamic-oxaloacetic and serum glutamic-pyruvic transaminases (S.G.O.T.…”