Is Michael's illness cancer related?

I know everyone is wondering if Michael's illness is cancer related. The doctors have checked and there is no evidence of cancer at this time. Michael received all his childhood immunity shots in 2008 and is up to date with his vaccines. He had the Snoopy bandage to prove it! His bone marrow doesn't have the immunity of an adult. Many adults were exposed to swine flu in the 70s, providing minimal protection against H1N1. His immature bone marrow never was exposed to it. This infection should provide good protection against H1N1 in the future. He was not able to get the flu shot or H1N1 shot this year due to previous reactions. Going forward he will get a series of vaccines to decrease the chance of developing influenza in the future.