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Chickenpox in adult man. Chickenpox blisters on a man's back. Chickenpox, or varicella, is caused by infection with the herpesvirus varicella-zoster. It is common in children but, because infection confers lifelong immunity to the disease, rare in adults. Symptoms include a mild fever followed by the development of a rash of small red itchy spots over most of the body. The spots become fluid-filled blisters within a few hours. Although it is a mild disease in children, it can be much more serious in adults. In adults it may lead to severe pneumonia, which can be fatal. Photographed in India.
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