The Velvet Virus UndergroundS

[Hong Kong, May 1. Image via Getty]

A mother and daughter wear masks while riding on the Hong Kong MTR system, the city's underground network, on May 1, 2009. Hong Kong authorities said on April 30 that two women admitted to hospital with flu-like symptoms had tested negative for swine flu as the city stepped up measures to prevent the spread of the disease. AFP PHOTO / MIKE CLARKE (Photo credit should read MIKE CLARKE/AFP/Getty Images)