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Pandemic may refer to:
A widespread outbreak of an infectious disease across multiple countries or continents.
The COVID-19 pandemic caused by the SARS-CoV-2 virus, first identified in late 2019.
The 1918–1920 influenza pandemic (often called the Spanish flu) caused by an H1N1 virus subtype.
The long-running global pandemic of HIV infection and AIDS disease, recognized in the late 20th century.