Government cleaners wearing masks draw the blinds before disinfecting a classroom at a school in Hong Kong May 28, 2009. The government's decision to suspend classes in the school came after the announcement of three additional cases of H1N1 in Hong Kong. One of the three cases was a student from the school, who had travelled to Canada in the past week and visited the school upon her return. REUTERS/Tyrone Siu (CHINA POLITICS HEALTH EDUCATION)