Book About Germs

I came across a great book about germs called Bill Nye the Science Guy's Great Big Book of Tiny Germs. I haven't used this book at this point, but I will some day. (I think we've spent too long on bacteria, viruses, etc, and it's time for us to move on.) But, this book is great! It has lots of hands-on activities, diagrams, and demonstrations that would really help to explain "germs" to a wide range of ages.