CHICKENPOX (VARICELLA) By Dr Harivansh Chopra   Chickenpox is one of the classic childhood diseases. A child or adult with chickenpox may develop hundreds of itchy, fluid-filled blisters that burst and form crusts. Chickenpox is caused by a virus.   The virus that causes chickenpox is varicella-zoster, a member of the herpesvirus family. The same [...]