Recovery from IN infection is easily monitored by observing increases in animal body weight and by measuring: 1) blood neutrophilia; 2) serum IFN-γ; 3) ALT/AST; 4) infectivity titres; 5) DNA genome equivalents; and 6) levels of circulating IFN-γ secreting CD4 and CD8 T cells (Table 2). Here, CD8A is linked to infection.