Infectious diseases (athletes)
Infectious diseases are often a serious issue for athletes, and those in the care of athletes must often be alert to the possibility of getting an infectious disease for the following reasons: There is the chance, or even the expectation, of contact or collision with another player, or the playing surface, which may be a mat or artificial turf. The opportunities for skin breaks, obvious or subtle, are present and compromise skin defenses.
Source: Wikipedia — Infectious diseases (athletes) (CC BY-SA 4.0)