Young girl with chickenpox. Chickenpox or varicella is a common infectious disease of childhood caused by the varicella- zoster virus. It causes headache and fever followed by eruption of a rash over most of the body. The rash appears in crops and consists of clusters of small, red, itchy spots that become fluid-filled blisters within a few hours. It is rare to have the disease twice, as a childhood attack confers lifelong immunity. While the disease is not serious in children, in adults it can be dangerous.
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