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Usborne Lift-the-Flap First Questions and Answers: What is a Virus? Class Code_DB1 The final jewel of Poseidon'sDescription Our lives have been taken over by a tiny virus we can't even see. But what IS a virus? How do viruses spread? Why should everyone keep washing their hands? How does a vaccine work? And what can we do to STAY WELL? Lift the flaps to find out. Video