from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Inoculation with a vaccine made from microorganisms obtained from the recipient's own body.
- noun An infection caused by a disease that has spread from a different part of the body.
Sorry, no etymologies found.
Specifically, the guidance said the masks "are a barrier to splashes, droplet sprays, and autoinoculation of influenza virus from the hands to the nose and mouth.