As a ex dental worker I know how it goes and this has happened but luckily it wasnt no disease.
What happens and it just takes 1 person to fukk over everyone is that who ever is sterilizing or is responsible for it will make the mistake and depending how big the machine is several cassettes will not be properly clean and ur not gonna know once u unwrap it either unless it's really bad left over residue.
I wont say who what where this happen but know it got caught in my case cuz either it was me or another person knew real quick that cassette was just barely down there due to a certain color to 2 of the instruments and man it was bad
Even tho I didnt cause it I had to call all the patients to let them know what happened and I got cursed out like no other and all I could do was apologize
New restrictions was implemented after that