Fig. 3.

P815 cell killing by peripheral blood mononuclear cells (PBMC) from woodchucks with newly acquired and chronic woodchuck hepatitis virus (WHV) infections. Circulating lymphomononuclear cells isolated from animals with newly induced preacute or acute WHV infection (14 PBMC samples; hatched bars) or with chronic hepatitis (11 PBMC samples; □) and from healthy woodchucks (10 individual PBMC samples; ▪) were incubated with ⁵¹Cr-labelled P815 cells at indicated E:T ratios. Results for each E:T ratio are expressed as a percentage of the specific lysis induced by PBMC derived from healthy animals and tested at the same E:T ratio (taken as 100%).