<p>A staff member walks over a sign reminding staff to wash their hands as a precaution when leaving wards at a hospital in Singapore April 27, 2009. Countries around the world have moved to contain the spread of a possible pandemic after a new swine flu outbreak killed 103 people in Mexico. Twenty cases have been identified in the United States and six in Canada, with no deaths reported. REUTERS/Vivek Prakash</p>
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