Figure 3).

Effect of ribavirin on fetal Rhesus monkey kidney cells (FRhK-4) persistently infected with hepatitis A virus. Cells were treated either during the first passage or during both first and second passages. The percentage inhibition was calculated (S/N ratio of untreated HAV – S/N ratio of treated HAV × 100) ÷ S/N ratio of untreated HAV, where S/N ratio is the ratio of sample to negative control mean hepatitis A virus antigen harvested from treated or untreated infected cell cultures