Students wear face masks as a precaution to the swine flu pandemic as they sit during an examination at a school in Putrajaya
Students wear face masks as a precaution to the swine flu pandemic as they sit during an examination at Putrajaya Presint 9 (2) Secondary School in Putrajaya outside Kuala Lumpur, August 10, 2009. The H1N1 flu outbreak, declared a pandemic in June, has spread around the world and could eventually affect 2 billion people, according to World Health Organisation estimates. The virus has killed more than 800 people worldwide since emerging in April. REUTERS/Bazuki Muhammad (MALAYSIA HEALTH EDUCATION RELIGION IMAGES OF THE DAY)
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