Welcome to Jurassic Habitat

Ah, now that's something I hadn't thought of. We don't want viruses, bacteria, or fungi escaping research labs any more than we want dinosaurs escaping. Less, in fact, because dinosaurs would be easier to find, and wouldn't reproduce nearly as quickly.

Probably have a very small number of human beings working those labs, signing all sorts of disclaimers and going through lengthy, unpleasant, and (to most people) embarrassing decontamination procedures every time they leave, and again when they come back.