Sting of Bug Bites Can Linger Into Adulthood By Amanda Gardner, HealthDay Reporter    HealthDayNews -- Contrary to popular belief, not all kids who are allergic to insect stings outgrow their sensitivity.    Some people whose allergies left them in fear of bees, wasps, and the like as children still react to their stings as adults, but a new study offers relief: Allergy shots given in childhood can protect them for up to 20 years...