White blood cells eat harmful germs. Antibodies attack specific germs that they have been in contact with before. For example, if you have had the chicken pox before your body has created antibodies to the virus that causes chicken pox. If you are exposed to the chicken pox again these antibodies will attack that virus. This is why you can only get the chicken pox once.
Hand washing is important because it reduces the spread of germs from one person to the next.
By washing our hands, we prevent germs from getting into our bodies as well as passing them onto other people. Because germs are everywhere it is important that we wash our hands so we don't ingest them when we eat or pass them on to someone else. Have your students show you the correct way to wash their hands. Make sure they count out loud for 15 seconds. If you still feel sick and have a fever after a couple of days, see your doctor.