Any advice on the school nurse sending an email to the parents that lice has been reported in your son’s class?

I got an email from my son’s school nurse saying that lice has been reported in my kindergartens classroom. They obviously didn’t tell which kid in the class and I immediately checked his hair and scalp as soon as he came home and luckily I didn’t see any. I put his clothes that he was wearing today as well as his backpack and washed it in hot water to hopefully get rid of the lice that he may have gotten. Any advice on this? He has short hair so it’ll be easy for me to tell if he did have it…any advice?