Try this the next time.
A pot of boiling water.
Pour the boiling water in the bag to sanitize.
If you use seasonings, steam them first.
The beef, freeze the surface of the beef, and dip into boiling water for a few seconds, then use clean tools to put the beef into the bag and sous vide.
You should be OK.
You will get amazing short ribs that cannot be done any other way.
Beef is regularly consumed raw, It is the exterior which you need to...