Chickenpox : is a viral infection that causes an itchy, blister-like rash. Chickenpox is highly contagious to people who haven't had the disease nor been vaccinated against it. Before routine chickenpox vaccination, virtually all people had been infected by the time they reached adulthood, sometimes with serious complications. Today, the number of cases and hospitalizations is down dramatically.
For most people, chickenpox is a mild disease. Still, it's better to get vaccinated. The chickenpox vaccine is a safe, effective way to prevent chickenpox and its possible complications
TREATMENT
In high-risk group, antiviral drug such as acyclovir (Zovirax) or another drug called immune globulin intravenous (IGIV) can be suggested. These medications may lessen the severity of the disease when given within 24 hours after the rash first appears. Other antiviral drugs, such as valacyclovir (Valtrex) and famciclovir (Famvir), also may lessen the severity of the disease, but they have been approved for use only in adults. In some casesit is recommend to get the chickenpox vaccine after exposure to the virus. This can prevent the disease or lessen its severity.
Don't give anyone with chickenpox — child or adult — any medicine containing aspirin because this combination has been associated with a condition called Reye's syndrome.