Researchers work to determine how H1N1 becomes pandemic
Monday, August 15, 2011 - 10:00
in Health & Medicine
The last century has seen two major pandemics caused by the H1N1 virus -- the Spanish Flu in 1918 and 2009's Swine Flu scare, which had thousands travelling with surgical masks and clamoring for vaccination. But scientists did not know what distinguished the Swine Flu from ordinary influenza in pigs or seasonal outbreaks in humans, giving it the power to travel extensively and infect large populations.