A passenger walks past a quarantine sign at Taoyuan International Airport, northern Taiwan
A passenger walks past a quarantine sign at Taoyuan International Airport, northern Taiwan, April 28, 2009. A new virus has killed up to 149 people in Mexico and the World Health Organization moved closer on Monday to declaring it the first flu pandemic in 40 years as more people were infected in the United States and Europe. The WHO raised its pandemic alert level for the swine flu virus to phase 4, indicating a significantly increased risk of a pandemic, a global outbreak of a serious disease. REUTERS/Nicky Loh (TAIWAN HEALTH IMAGES OF THE DAY)
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