If you're happy working the way you do, then that's fine. Especially if you're a worrier.
The doctors that I have asked have all told me that it is impossible to say how a person got the MRSA bug. For example, you couldn't pinpoint it down to a brow wax.
Also, the client would have to be extremely ill to get it in the first place, in which case......you shouldn't be waxing them anyway. It all goes back to basics. Contra-indications. That's why I always ask, 'Ok, so you're feeling fit and well today?' before I wax. xxx