WHO Raises Pandemic Flu Threat Level

Monday, April 27, 2009 - 18:56 in Health & Medicine

And now some good news to end the day. This afternoon, after the US Center for Disease raised the number of swine flu cases in America from 20 to 40, the World Health Organization (WHO) raised the pandemic threat level from three to four, out of six. Level four means the virus has been observed transferring from human host to human host without an animal intermediary, and is the final step before the WHO declares a pandemic underway. read more

Read the whole article on PopSci

More from PopSci

Latest Science Newsletter

Get the latest and most popular science news articles of the week in your Inbox! It's free!

Check out our next project, Biology.Net