Chickenpox Vaccination

Chickenpox is a highly infectious disease that usually causes an itchy red rash with blisters. It is one of the most common childhood diseases and can affect pregnant mother. The vaccine contains a weakened form of the chickenpox (varicella-zoster) virus and works by causing the body to produce antibodies (resistance) to protect against the disease. The vaccine should not be given if patient:

• Has history of allergic reactions to medicines or substances such as itchy rash, shortness of breath and swelling of the face and tongue.
• Is pregnant or intend to become pregnant within one month of vaccination.
• Has low immunity. Due to abnormal blood conditions, cancer, or certain medications.
• Has a severe infection with a high temperature.
• Had another live virus-containing vaccine within the last month, such as a measles, mumps or rubella vaccine.

The vaccine is administered by injecting the vaccine under the skin of the upper arm or thigh. Adults are generally given two doses, one to two months apart. The vaccine can have side effects; however, these are usually not serious. Side effects include:

• Redness, swelling, or soreness at the injection site;
• Mild temperature;
• Mild chickenpox like rash may develop within a month;
• Allergic reaction, usually not serious.

Does the vaccine always prevent chickenpox?

Recent studies have shown the vaccine to be 95 percent effective toward preventing chickenpox and 100 percent effective for preventing severe complications such as pneumonia (severe lung infection). Even though those vaccinated can still get chickenpox, these "breakthrough infections" are mild and usually result in only a few days of a low-grade fever and a few spots.

Does the chickenpox vaccine last?

Studies in Japan have shown protection lasts for at least twenty years.