Our local show is put on by the local herp club (ERAS). They have myself (AHT) do health checks on the Saturday morning. It's not a perfect system, but animals that are dehydrated, show signs of diarrhea, external parasites, illness, injury etc. are removed from the premises. Each table also has alcoholic hand sanitizer that is strongly encouraged before and after the handling of any animal. We also have strict (but hard to enforce) rules on being a captive bred only venue. My opinion is that any show promoter should take precautions to protect it's vendors and the public. Little Johnny's first snake should be a healthy one!

Additionally, for show vendors the ideal system is to once again quarantine show animals prior to returning to their reptile room. Most people skip this step, myself included due to the practicality of it. Nonetheless it is the safest way.