Can someone educate me on HFM? What is your personal experience? School protocol?

Chloe is in preschool. Last Friday, a classmates mom texted me to see how Chloe felt. She had been playing predominately with three other classmates, all of who were sick with fevers. At the time, Chloe was fine.

I took her to school Monday, but she developed a 103* fever that afternoon. Come to find out, 2 of the 3 kids (from the text the precious Friday) had HFM. I kept Chloe home from school on Wednesday & took her to the pediatrician. They ruled out HFM and strep throat, and Chloe is feeling better now.

I let her go to school today. Six kids in her class of 12 have HFM. Some younger siblings of her class mates have it, and one parent does. One sick classmate was at school both Wednesday and today, and I am LIVID.

Who sends their sick, contagious child to school? Isn't there some kind of protocol about this? Common sense? Isn't this kid miserable?

I'm mostly worried about our 4 week old, but of course I don't want anyone else to catch HFM. I hear it's miserable. I don't need any more miserable in our house. We are in growth spurt hell.

Should I say something to the school director? The preschool teacher? My mom suggested they might not even know the kids are sick, or know they're sick but not know it's HFM.

Ahh what if they aren't disinfecting well enough? Gross!