Chickenpox (varicella) is a common, preventable childhood infection caused by the varicella-zoster virus. An itchy rash of spots that look like blisters can appear all over the body and may be accompanied by flu-like symptoms. Chickenpox is very dangerous for people with immune system problems like leukemia, or for people who are taking drugs that weaken the immune system. This is a very uncomfortable situation for your child. Chickenpox usually occurs in late winter and early spring.
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