How can something so tiny cause so much havoc? Open the flaps to find out. Get the lowdown on these sneaky, microscopic intruders, from how they infect us to how our bodies fight them off. Meet the germ detectives who have managed to track them down. And spare a thought for the zillions of other microbes who are perfectly harmless - or may even be super helpful. Using authentic kids' questions, carefully considered answers and quirky, characterful illustrations, this book provides an excellent introduction to our invisible enemies.