source control

Noun

source control (uncountable)

1. A technology that handles access to computer files containing source code so that several users can work on the files without interfering with each other's changes.
2. Measures applied to the source of an infection to reduce further contamination and spread.
3. (public health) Measures applied to potentially-infected people that reduce their chances of infecting others.
   • But the opposite concern also exists: egress, or transmission of particles from the wearer to the outside world. Historically, much less research has been conducted on egress, but controlling it—also known as “source control”—is crucial to stopping the person-to-person spread of a disease....2020 April 22, Zeynep Tufekci et al., “Real Reason to Wear a Mask”, *The Atlantic* (online)