2009 swine flu outbreak was 15 times deadlier: study | Reuters
http://www.reuters.com/article/2012/06/26/us-swineflu-idUSBRE85O1DF20120626
The swine flu pandemic of 2009 killed an estimated 284,500 people, some 15 times the number confirmed by laboratory tests at the time, according to a new study by an international group of scientists.