原文The 2009 Swine Flu in the US, which ended up infecting 55 million Americans and killed 11,000 of them, the first cases started to appear in late March, the CDC identified it on April 17, and the identification kits were not generally available until mid-May. And that was 250 people working 100+ hour a week! 2009 flu pandemic in the United States And this is the CDC, the best infectious disease research agency in the world, with $11 billion a year budget and 11,000 employees!