[Hepatitis C antibodies in acute Non-A, Non-B hepatitis].

Stored serum samples of 20 patients with clinically and bioptically proven non-A, non-B hepatitis (NANBH) in the acute stage were tested for the presence of antibodies to hepatitis C virus (anti-HCV) by means of the Ortho ELISA system. After a mean period of 8 weeks from onset of the disease, 8 of 20 patients (40%) had anti-HCV. Our follow-up study included 14 patients. Of 9 primarily anti-HCV-negative patients, 2 became positive after 2 and 7 months respectively, whereas 7 patients remained anti-HCV-negative up to 52 months (range 1-128) after the onset of hepatitis. The prevalence of anti-HCV was 71% in 7 patients with parenteral hepatitis related to transfusions (n = 2) or drug abuse (n = 5), and 38% in 13 patients with sporadic NANBH. Of the 8 anti-HCV-negative patients with sporadic NANBH, 5 had stayed in one of the countries where enterically transmitted NANBH is endemic 3 to 6 weeks before the onset of their disease. Our results show that at present the anti-HCV-test supplies an etiologic basis for approximately half of all cases of NANBH in acute stage. Nevertheless, in most cases the acute NANBH remains a diagnosis of exclusion.