Such so-called "breakthrough" infections are usually milder than normal chickenpox, with fewer lesions ... for Disease Control and Prevention (CDC). "This very safe vaccine has been extremely ...

Studies have shown the vaccine that protects just against chickenpox is 82% effective against any form after one dose and 92% effective after two doses, according to the CDC. Receiving one or two ...

Prior to the introduction of the vaccine against chickenpox, it was most common in children, and the CDC reports 90% of cases, 70% of hospitalizations and about half the deaths from varicella ...