Cracking the code: A look at bird flu strains

H5N1, H7N3, H7N9, H5N2, H7N8.

What do these mysterious series of letters and numbers mean, and why should we pay attention to them?

Some of these numbers might ring a bell if you pay close attention to the news. All of the above are strains of avian influenza, otherwise known as bird flu. H5N1 is […]