A visitor washes her hands beside an infection control notice at a hospital in Hong Kong

 
A visitor washes her hands beside an infection control notice at a hospital in Hong Kong
A visitor washes her hands beside an infection control notice at a hospital in Hong Kong April 27, 2009. Hong Kong has escalated its alert level to "serious" in response to the swine influenza outbreak in humans in Mexico and the U.S., Hong Kong government said on Sunday. REUTERS/Bobby Yip (CHINA HEALTH)