"It may have already been everywhere for weeks -- but disappeared unnoticed into the normal flu background until the latest alarm spread. That could, curiously

"It may have already been everywhere for weeks -- but disappeared unnoticed into the normal flu background until the latest alarm spread. That could, curiously enough, be a good sign -- it means it's not so incredibly worse than other flus" This is exactly what I thinking. e.g. A coworker came to Mexico from Sacramento CA a month a go. When he went back home he spent a week in bed with a really bad flu. I am thinking he could have acquired the swine flu then but no one noticed.