As usual, EffectMeasure is one step ahead of me. A news report came out yesterday suggesting that influenza may infect people through the gut. At least 4 routes of evidence suggest this possibility. 1) In birds, influenza is an intestinal infection. 2) Several cases of H5N1 have presented with diarrhea, generally uncommon in human influenza infections. 3) H5N1 virus has been isolated from rectal swabs from humans. 4) Some people have no risk factors for infection besides drinking duck blood. Revere further elaborates on all the red flags this virus has raised.