Whether they're environmental, food, or medicine, allergies seem to be everywhere these days. And given the way that they spread among us like body snatchers, you shouldn't be surprised! Did you know that having one allergic parent means their children have a 33% of inheriting allergies? And if both are allergic, the chances double to 70%! In America, for a variety of reasons, allergies are on the rise in all their forms. This infographic explains how they work and how they're spreading.