1. Centers for Disease Control and Prevention (CDC), Healthcare-Associated Infections (HAI). http://www.cdc.gov/hai/.
2. Centers for Disease Control and Prevention, The 2009 H1N1 Pandemic: Summary Highlights, April 2009–2010: http://www.cdc.gov/h1n1flu/cdcresponse.htm.
3. Centers for Disease Control and Prevention (CDC), Division of Global Health Protection (DGHP). http://www.cdc.gov/globalhealth/healthprotection/default.htm.
4. Centers for Disease Control and Prevention (CDC), National Center for Infectious Diseases (NCID), Emerging Infectious Diseases. http://www.cdc.gov/ncidod/diseases/eid/index.htm.
5. Emerging Infections Network (EINet), University of Washington. http://depts.washington.edu/einet/.