== وصلات خارجية ==* WHO - Authoritative source of information about global health issues* Past pandemics that ravaged Europe* CDC: Influenza Pandemic Phases* European Centre for Disease Prevention and Control - ECDC* The American Journal of Bioethics' ethical issues in pandemics page
==External links==* WHO – Authoritative source of information about global health issues* Past pandemics that ravaged Europe* CDC: Influenza Pandemic Phases* European Centre for Disease Prevention and Control – ECDC* The American Journal of Bioethics' ethical issues in pandemics page*TED-Education video – How pandemics spread.