The Mystery of America’s Peanut Allergy Surge—And the Promising Science behind New Treatments Peanut allergies more than tripled in U.S. kids between the late 1990s and late 2000s, and the prevalence has risen even more since then. Scientists are still searching for answers—and new ways to treat them. By Rachel Feltman, Jeffery DelViscio, Fonda Mwangi…