In one of such studies, Wakeham et al. showed that the level of pro-inflammatory cytokines such as TNF-α, INF-γ, MCP-1, and IL-12, as well as influx of neutrophils in the BAL were higher in BALB/c, than in C57BL/6, during the first 14 days following the infection. This evidence concerns the gene TNF and infection.