Varicella vaccination

Varicella vaccination is a vaccine that protects against chickenpox, a disease caused by the varicella-zoster virus. The vaccine was first licensed in the United States in 1995 and is now widely used in many countries around the world.

History

The varicella vaccine was developed by Michiaki Takahashi, a Japanese virologist, in the 1970s. The vaccine was first licensed for use in Japan and Korea in 1988, and was later approved by the FDA in the United States in 1995.

Effectiveness

The varicella vaccine is highly effective at preventing chickenpox. Studies have shown that the vaccine prevents chickenpox in about 98% of people who get both doses. The vaccine is less effective after one dose, but still offers some protection.

Administration

The varicella vaccine is given by injection. In the United States, it is recommended that children receive two doses of the vaccine, with the first dose given at 12 to 15 months of age and the second dose at 4 to 6 years of age. Adults and older children who have not been vaccinated or had chickenpox should also receive two doses, with the doses given 4 to 8 weeks apart.

Side effects

Like all vaccines, the varicella vaccine can cause side effects. The most common side effects are mild and include redness, soreness, or swelling at the site of the injection and a mild rash. Serious side effects are rare.

See also

• Vaccination
• Chickenpox
• Varicella-zoster virus