Accordingly, we surveyed the IEDB and extracted B-cell, CD4 T-cell, and CD8 T-cell epitope data pertaining to the influenza H1N1, including pre-pandemic seasonal H1N1 and 2009 pandemic H1N1 (Organism ID:114727), H3N2 (Organism ID:119210), and H2N2 (Organism ID:114729) subtypes, which have historically circulated in humans (49, 50), and for which immune memory is therefore expected to be prevalent. Here, CD4 is linked to swine influenza.