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Merrin and Pearls cousin Max is sick, threatening everyones Mexican holiday. This time the girls find themselves in Maxs body, witnessing first hand the immune system in action. They befriend a white blood cell warrior who leads them into battle against the offending bacteria. Human Body Detectives: Battle with the Bugs Heather Manley Book Trailer
Find out more about this author here
Find out more about this book here.
