There's another reason for getting a shot for chickenpox. The illness is highly contagious and without the vaccine, it can be spread by direct contact or through the air by sneezing or coughing . Also, someone can get it by coming in contact with fluid from chickenpox blisters . For that reason, children with chickenpox need to be kept out of school or day care for about a week or more until all blisters have dried and crusted over. The illness causes an itchy rash that usually forms between 200 and 500 blisters over the entire body, headaches , coughing , and fussiness. So even if the illness is mild, it still means five to 10 days of being uncomfortable.
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