1 in 5 people infected with swine flu during 1st season of epidemic.

1 in 5 people infected with swine flu during 1st season of epidemic, WHO-led research shows ‘At least one in five people worldwide had been infected with swine flu during the first calendar year of the 2009-2010 H1N1 pandemic, on Friday a global research group said, but the death rate was 0 just.02 %,’ Reuters reports . The WHO-led study ‘looked at more than 90,000 blood samples before and through the pandemic in countries including India, Australia and the U read .K.,’ and ‘showed many people had been infected, although not all would have developed full-blown flu,’ BBC Information notes .