You may think that gowns, gloves, face guards and such are adequate protection, but regardless of these, you must never, NEVER, EVER turn your back on a zombie at any time, or the next thing you’ll know they will be gnawing away at your gluteus maximus.

Some prep before the visit: Make sure your ventilation system and its exhaust ports allow for the most efficient removal of the various offending odors you will encounter. Probably best to schedule your zombie as the last patient of the day, though that having been said, even if you don’t, it probably will be your last patient of the day for various reasons. Have some nose plugs handy, in the event that mouth-breathing becomes ineffectual. Some find that a suitable dose of an antiemetic before the visit may reducing retching, though to my knowledge there are no studies on this as prophylaxis.
Adequate cleaning and recleaning (and the occasional rerecleaning) of the exam room is of the utmost importance. I believe that there some tentative plans by GE Healthcare to market a so-called “self-cleaning” exam room, modeled after self-cleaning ovens, in which high temperatures incinerate any residue (and believe me, there will be residue) left behind. If you do get one of these, remember to remove the zombie prior to switching on the self-cleaning system, otherwise you will run afoul (sic) of various EPA (and maybe FAA) regulations.