(medicine) Influenza caused by certain orthomyxoviruses, which pass from pigs to humans.

(idiomatic, politics) An illness feigned by one or more government officials or other public figures as an excuse for an absence really based on political factors.

(informal, proscribed) Gastroenteritis.

plural of stomach flu

swine influenza

(UK) A designated friend or relative who collects medicine on behalf of a person with flu who has been advised to remain at home.

(slang, derogatory) chronic fatigue syndrome

(slang, vulgar) Flulike symptoms caused by acute retroviral syndrome.

(UK, informal) A cold or similar illness contracted by new students at a university, caused by gathering people (and the diseases they carry) from a wide variety of places in a confined area, allowing the diseases to spread to those without immunity.

A form of influenza that originated in China and became a worldwide pandemic in the 1950s.