A runny nose alone doesn't scare me. A lot of kids are going to have runny watery noses in the winter season. It can be from the cold weather, or it can be from allergies in the fall. A sniffle is not going to do much damage, especially with good hand hygiene.
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."
In 2013, on a particularly challenging morning, my coffee machine broke right after my son was diagnosed with leukemia. I was utterly exhausted and scared, needing that caffeine boost to manage my emotions and responsibilities.