P2RY2 and infection: As neutrophils are massively recruited during PVM infection, chemokine KC (CXCL-1) and MIP-2 (CXCL-2) - two major chemokines involved in neutrophils recruitment in mouse - were measured in the BALF of P2Y2+/+ and P2Y2−/− mice by ELISA at days 8, 9, 10 and 12 post-infection.