freshers' flu

From fresher (“a new student”) and flu (“disease”), an abbreviation of influenza.

freshers' flu (uncountable)

1. (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.

• con crud (contracted at conventions)

• reshufflers