Urticaria is the scientific name for hives. What’s known about it? All your questions answered
The severe reaction happens when a person is exposed to the particle for a second time in their life, after their body had wrongly "marked" it as dangerous during the first exposure.
The "alpha-gal" meat allergy is caused by the bite of the lone star tick.
The preschool teacher told the student's mother that if anything happened to him at school it was the parents' responsibility, not hers.