Health officials fear Hajj could help spread H1N1 virus . Muslims from all over the world travel to Mecca for Hajj . Authorities offer advice on how to minimize risk . Comment:
Health officials fear Hajj could help spread H1N1 virus . Muslims from all over the world travel to Mecca for Hajj . Authorities offer advice on how to minimize risk . Hajj will provide real test for disease detection , official says .