Interestingly, while IAV infection of BMDC at low multiplicities of infection (MOI) resulted in enhanced CD8 T cell responses following in vitro stimulation, high MOI resulted in blunted CD8 T cell responses, increased IL-12p40 production [8] and increased production of the anti-inflammatory cytokines IL-10 and TGF-beta [9]. Here, IL10 is linked to infection.