https://www.cdc.gov/healthyyou...
We are strong into flu season and there are some reports of tough strands out there. This is a good time to remind ourselves about the importance of personal health and trying to minimize the spreading of germs. Good hand washing, covering coughs and sneezes all go a long way to help. Flu shots and vaccinations can also be beneficial. Remember to take care of you and your child if they do get sick, ensuring they are fever free and not contagious when returing to school after an illness.
The website linked is from the Center for Disease Control and has a host of resources regarding all health related issues, as well as special attention to those pertinent to schools.