Why our allergies are getting worse and what to do about it

If it seems like your seasonal allergies are getting worse over time, you're probably not wrong.Estimates are that 30 to 40% of the world's population now have some form of allergy, and medical anthropologist Theresa MacPhail says allergic reactions including everything from hay fever to eczema and asthma are growing in the U.S. and around the world.

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