ITGAM and infection: After screening various cell types positive for JEV NS1 Ag, we found that CD11b+Ly-6C+ monocytes and their matured CD11b+Ly-6C+F4/80+ macrophages were preferentially positive for JEV NS1 Ag in the JEV inoculation site (footpad) in the early stage (1 dpi) of infection.