This article covers a real-world subject which should not be taken as part of the Holby universe.
"Perfect Day" is the 538th episode of Casualty and the 44th episode of the 20th series.
Synopsis[]
Nathan embarks on a hunt to find out who failed to dispose of the needle that pricked him. A patient in the hepatitis B clinic tries to steal drugs, jeopardising Maggie's efforts to keep it open, while Nina and Kelsey make a bet on whether Greg is gay after discovering he wears mascara.
