Actually, it does. Animals kept in close confinement are far more likely to spread disease and be ill. The energy it takes to roam and free range will drag an infected animal down. Observe the animal, is he active, alert, feathes clean and bright, eyes clear, and overall appearance looks healthy. Sure, a healthy looking critter can be a carrier of disease, everybody can carry disease, but it's nothing to get negative and paranoid about. That's how I figure that.