Chickenpox, also called varicella, is an acute viral disease. It is caused by the varicella-zoster virus. Symptoms include fever, general malaise, and a rash which begins with small reddish bumps (papules) that quickly fill with fluid to form small blisters (vesicles).
David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
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