Your overthinking this. The US version of the swine flu is both rare and really no more dangerous then many other types of influenza out there. Despite the media hype, this is not an epidemic yet at any level.At water filled places like Harbin you need to protect yourself against skin ailments and staph infections. The easiest way to prevent either is to use a towel to sit on at all times and make sure any cuts and scrapes you get while visiting Harbin are cleaned and disinfected.