Jun 04, 2013 05:56 PM EDT
H1N1, H5N1, H7N9 Flu? What On Earth Does It All Mean
Ever wondered what flu classifications mean? The pandemic influenza strain, or swine flu, that spread globally in 2009 was referred to as H1N1 and the new bird flu currently spreading in China is A H7N9. Most of us can probably understand what is meant by bird or swine in this context but what do th...