seroprevalence of hav, hbv, hcv, and hev among acute hepatitis patients at kenyatta national hospital in nairobi, kenya. | acute viral hepatitis is most frequently caused by the hepatitis a virus (hav), hepatitis b virus (hbv), hepatitis c virus (hcv), hepatitis d virus (hdv) and hepatitis e virus (hev). | 2012 | 26856042 |