A pandemic (/ pænˈdɛmɪk / pan-DEM-ik) is an epidemic of an infectious disease that has a sudden increase in cases and spreads across a large region, for instance multiple continents or worldwide, …

Apr 29, 2026 · A pandemic is an outbreak of infectious disease that spreads across multiple countries or continents, affecting large numbers of people. The World Health Organization defines it simply as “a …

May 5, 2009 · A pandemic is an outbreak of infectious disease that occurs over a wide geographical area and that is of high prevalence, generally affecting a significant proportion of the world’s …

3 days ago · An epidemic that has gone international is referred to as a pandemic: the disease, once localized in scope, now starts to appear in other countries and even on other continents, typically …

Mar 5, 2026 · A pandemic is a disease outbreak that spans several countries and affects a large number of people. Pandemics are most often caused by viruses which can easily spread from person to person.

Sep 15, 2025 · A pandemic is an epidemic that's happening around the world. Sometimes, doctors also talk about epidemics of other health conditions, such as an epidemic of obesity, diabetes, or …

6 days ago · CDC works 24/7 to protect America from health, safety and security threats, both foreign and in the U.S.

A pandemic is the worldwide spread of a new disease.An influenza pandemic occurs when a new influenza virus emerges and spreads around the world, and most people do not have immunity. …

An epidemic that spreads globally is a pandemic. The 1918 Spanish influenza, which infected more than one-third of the world’s population and killed approximately 50 million people, is the most famous …