A Philippine health specialist demonstrates how to extract RNA samples from suspected flu patients so as to determine if they are infected with the A/H1N1 virus at a laboratory in Manila on May 14, 2009. All 49 visitors who were quarantined in the Philippines for developing flu-like symptoms have been discharged after doctors cleared them of Influenza A/H1N1 infection, Health Secretary Francisco Duque III said Thursday. | Location: Manila, Philippine.
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