Centers for Disease Control and Prevention (CDC)
http://www.cdc.gov/

Health Protection Agency (HPA)
http://www.hpa.org.uk/

Health Protection Scotland (HPS)
http://www.hps.scot.nhs.uk/

Joint United Nations Programme on HIV/AIDS (UNAIDS)
http://www.unaids.org/

National Institutes of Health (NIH)
http://www.nih.gov/

UK Advisory Panel for healthcare workers infected with bloodborne viruses (UKAP)
http://www.hpa.org.uk/HPA/Topics/InfectiousDiseases/InfectionsAZ/1203496960618/

World Health Organization (WHO)
http://www.who.int/