The H1N1 piggy flu has struck at the Penny Arcade Expo, reports… everyone. At a gathering that attracts something like a bazillion people, this could be a major issue, and PAX organizers are taking it seriously. Penny Arcade has a list of known-to-be-infected flights and rail lines relevant to PAX, and while all medicos agree that the flu is comparatively mild when gotten by healthy people, anyone feeling symptoms are encouraged to stay home (or …