(medicine) An acute contagious disease of the upper airways and lungs, caused by a virus, which rapidly spreads around the world in seasonal epidemics.

plural of influenza

(pathology) Any strain of influenza carried by and primarily affecting birds.

(pathology) A form of influenza that spread to nearly every part of the world in a pandemic between 1918 and 1920, killing from 20 to 100 million people.

(pathology) swine flu

Alternative letter-case form of Spanish influenza

The virus pandemic H1N1/09 virus. / The influenza caused by influenzavirus H1N1/09. / The outbreak of 2009 swine flu pandemic.

Synonym of Asian flu

Alternative form of Mexican influenza

Synonym of Hong Kong flu