Cells at work!

"Strep throat! Hay fever! Influenza! The world is a dangerous place for a red blood cell just trying to her deliveries finished. Fortunately, she's not alone... she's got a whole human body's worth of cells ready to help out! The mysterious white blood cells, the buff and brash killer T cells, even the cute little platelets--everyone's got to come together if they want to keep you healthy. Together, these dedicated cells will tackle everything from pneumonia to everyday allergies, and it's all in a day's work!"--Back cover.