Putting A Lid On The Spread Of Infection

The common phrase "put a lid on it" can apply to stopping something or setting a limit to it.  For example, putting a lid on spending means the same as a cap on spending.  More generally, the phrase is a request to cease and desist, applied to behaviour such as persistent complaining or playing loud music.

How do you put a lid on the spread of infection?  The answer is simple, effective and quite literal: put a lid on it.