Varicella vaccine is currently the most effective and safest preventive measure against chickenpox. The best time for vaccination, a healthy newborn baby can receive the first injection after reaching one year of age and the second injection at 4-6 years of age, so that the prevention rate can be close to 100%. If the chickenpox vaccine was not given during the normal period due to special circumstances, or if you are an adult, you can also get a catch-up vaccination at any time. The second dose should be given at least three months apart. Although the prevention rate will decrease, after the chickenpox vaccination, even if chickenpox occurs again, the symptoms are much milder than those of unvaccinated people, including benefits such as no accompanying fever and a very small amount of rash, which is less prone to complications.