TLR2 and infection: TLR2 is important for DC recognition of A. baumannii OmpA; however, there are conflicting reports regarding the impact of TLR2 knockout, whereby Kim et al. reported increased bacterial burdens in the first 24 h of infection in TLR2 −/− mice, while Knapp et al. observed significantly lower bacterial burdens at the same time point (Knapp et al., 2006; Kim et al., 2014; García-Patiño et al., 2017).