CD300LF and infection: To determine whether CD300lf was essential for infection in vivo, we challenged Cd300lf+/- and Cd300lf-/- littermates with 106 PFU PO of either MNoVCW3, MNoVCR6, MNoVWU23, MNoVCR3, or MNoVCR7 and measured viral genomes seven days post-infection (dpi).