IL1B and infection: In summary, these results show that different B cell subsets and TBLN-residing Tfh cells responded to immunization or pH1N1 infection and that the higher frequencies HA-binding plasma cells in the TBLNs and blood of the Ad-HA/NP+Ad-IL-1β-immunized pigs correlated with high HA IgG titers in serum of this treatment group.