Here are a few websites with lesson plans and printables dealing with Germs. Most are for the younger grades but can be adapted for older kids.
I want to thank everyone for their thoughtful comments and well wishes. I didn’t mean to sound like I was griping yesterday. I was just commenting on how we, as homeschoolers, can use everyday events as opportunities for learning. But I guess that goes without saying. BTW we are doing so much better.