Check This:

https://newyorklatestnews.com/new-york-tests-readiness-for-biological-attacks-by-deploying-safe-gas-in-subways-and-parks/305838/

https://www.dhs.gov/sites/default/files/publications/ea_utd_cbt_v7clean.pdf

Warning:

If your employer demanding vaccination status includes a legal clause saying you will be prosecuted for false statements, know that they are comparing over a dozen+ data points with the CDC to verify vaccination cards.

DON’T try to fake one.