Ubi pus, ibi evacua

{{short description|Medical Latin saying meaning, "Where there is pus, evacuate it."}}

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{{Lang|la|Ubi pus, ibi evacua}} is a Latin aphorism or adage, often cited[https://books.google.com/books?id=pvcAAAAAYAAJ&dq=ubi+pus+ibi+evacua&pg=PA226 American Medical Journal], Vol. 6, no. 6, June 18, 1876, p 226. in medicine, meaning "where [there is] pus, there evacuate [it]". It refers to what clinicians should do when there is a collection of pus in the body; that is, to create an opening for it to evacuate. A contemporary expression of the same sentiment is also used: "if there's pus about, let it out" or "let no sun set on an undrained abscess".

Examples include what an otorhinolaryngologist will often do in case of a child with chronic recurring otitis media: Insert a grommet in the eardrum to help evacuate the excess fluid within. Antibiotics often have difficulties getting into an abscess, and do not work well because of a low pH; evacuation through a drainage-channel, on the other hand, will remove a large number of bacteria and thus greatly aid the resolution of the infection.