We have been carrying quite a few chicken pox cases recently.
The pilots get to wear a lovely tyvek suit, gloves, goggles and mask while the seats in the back are covered with plastic.
The machine is sprayed with disinfectant after landing and left to stand out of the way for 2 hours then it it's cleaned by the guys with gloves, suits and mask etc.
So far no-one at work has caught it.
I would say definitely NO other pax unless also suspected infected and use common sense like masks, gloves etc and a good strong disinfectant.