Overseas
- World Health Organization (WHO)
- European Centre for Disease Prevention and Control (ECDC)
- Centers for Disease Control and Prevention (CDC), US
Fact Sheet
Infectious Disease Textbook
- Centers for Disease Control and Prevention (CDC), US. Health Information for International Travel (Yellow Book) – Chapter on Smallpox & Other Orthopoxvirus-Associated Infections (May 2017)
- Centers for Disease Control and Prevention (CDC), US. Health Information for International Travel (Yellow Book) – Chapter on Viral Hemorrhagic Fevers (May 2017)
- Public Health England (PHE). Immunisation against infectious disease (Green Book) – Chapter on Smallpox and vaccinia (March 2013)
Clinical Information and Management
- World Health Organization (WHO). Case definition for notification of smallpox under the IHR (2005)
- European Centre for Disease Prevention and Control (ECDC). EU case definition (June 2018)
- Centers for Disease Control and Prevention (CDC), US. Smallpox Clinical Disease
- Centers for Disease Control and Prevention (CDC), US. Prevention and Treatment
Vaccination