University of South Carolina School of Medicine: Margaret Hunt's "Influenza Virus (Orthomyxoviruses)"
Read this chapter to learn about different types of flu viruses. Orthomyxoviruses are more commonly known as the flu virus. There are many kinds of flu viruses, including H1N1.
Click http://web.archive.org/web/20160314162155/http://microbiologybook.org/mhunt/flu.htm link to open resource.