To examine the effect of a Salmonella Typhimurium strain 112910a infection on MHC I and II expression, the expression of MHC molecules on the surface of 112910a infected macrophages and uninfected macrophages (PAM112910a and PAMuninf, respectively) was measured immediately (0 h) and 24 h post inoculation (pi). This evidence concerns the gene HLA-C and infection.