Fig. 1.

IgG concentration in sera from the three groups of BALB/c mice:controls (non infected and not exposed to CCl₄), “CCl₄ alone”, “ MHV alone”, “MHV + CCl₄”. IgG concentration is expressed as the serum dilution to give an OD = 1.0 in ELISA 24 h (A) or 20 days (B) after the CCl₄ injection, i.e., 30 (A) or 50 (B) days after the MHV inoculation. Statistical analysis was performed by the Mann-Whitney U-test. *P < 0.05; **P < 0.001.