Below you’ll find the four vaccinations every adult needs, followed by two — for hepatitis A and B — that you need only if you have certain risk factors. What you won’t see on the list? Measles and chicken pox vaccines. Anyone born before 1957 wouldn’t need a measles vaccine because the disease was so prevalent when they grew up that immunity as an adult is assumed. Chicken pox is similar in that most adults already have immunity from childhood exposure to the disease, says Katz. “Almost all adults over 40 have been exposed to chicken pox,” she says, noting that it would be “an extremely rare case” for an adult not to have been. That said, if you think you could be in that tiny minority, ask your doctor about getting the chicken pox vaccine as an adult.