Peanut allergies are very common in the modern world. According to the American Academy of Allergy, Asthma & Immunology, between one and two percent of the U.S. population is allergic to peanuts. If you aren't allergic yourself, it's very likely that you know someone who is. Given that peanut allergies can be life-threatening, this also poses a substantial health risk around the world.
Since then, school policies have softened significantly. At L.A. Unified, for example, parents are directed to send their children to school if they have a mild cold or cough. The main symptoms that require keeping a child home are fever of 100.4 and above, vomiting or diarrhea, according to district instructions on "How to Safely Send Your Student to School."