Ubi pus, ibi evacua is a Latin aphorism or adage, often cited[1] 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.
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.
You can help Wikipedia by expanding it.This article related to Latin words and phrases is a stub.