The Rise of Allergies

There's a lot of information out there talking about how rates of allergies are increasing. Do you think there is a genuine rise in the population of allergic diseases? Or do you think this is us being just better able to pick them up? For different countries, we might have different prevalence and incidence data because they might have qualified and gotten data about deaths in a different way than another country. Not everyone uses the same definition when you go to the emergency room.