Flu vs. Lurgy — What's the Difference?

Influenza

An unspecified or indeterminate illness

Influenza.

A fictitious, highly infectious disease; often used in the phrase "the dreaded lurgi", sometimes as a reference to flu-like symptoms

Any of several infections that affect the respiratory or gastrointestinal tract and are caused by viruses other than the influenza virus.

Any uncategorised disease with symptoms similar to a cold or flu that renders one unable to work.

Influenza.

(informal) Stomach flu.

An acute febrile highly contagious viral disease