The mPDCA1+CD11c−B220−TcRβ− LAPCs initiate their migration out of the IAV-infected lungs into the draining lymph nodes relatively late in the course of infection (i.e., between 6–12 days post-infection (d.p.i.)) via CXCR3-CXCL9 dependent chemotactic pathway. Here, CXCL9 is linked to infection.