SCARB1 and infection: Interestingly, despite elevated levels of lytic MHV68 gene expression observed in acutely infected SR-BI-/- lungs, the frequencies of latently infected splenocytes and ex vivo MHV68 reactivation were similar in SR-BI-/- and BL6 spleens at 16 days post-infection (Fig. 2A and B).