The World Health Organization calls the spread of false information on coronavirus "infodemic". Learn how to spot fake news or false information.
A disease is an epidemic when it breaks out and rages in a community, only to subside afterward. (citation)
A series of cases of a disease which starts suddenly. (citation)
(adjective) Describing a widespread epidemic disease affecting large numbers of people in different countries simultaneously. The term should be reserved for human diseases; the equivalent term for animal diseases is panzootic. (citation)
What's the Difference between pandemic, epidemic and outbreak? See here