CDC recommends regular booster doses for people with prolonged increased risk for serogroup A, C, W, or Y and B meningococcal disease. However, the recommended interval between doses varies by age and vaccine type.
Work Group Interpretation Summary In relation to adults ages 50 years and older, the risk of COVID-19 increases with age; so, a 2nd booster (4th total dose) for older adults can help ensure those at risk are protected from severe disease. The current vaccine effectiveness data shows limited waning for immunocompetent adults after receiving a 3rd dose; and currently, there are lower COVID-19 ...
Polio Vaccine Recommendations Key points CDC recommends that all children get 4 doses of polio vaccine as part of the routine childhood vaccination schedule. Most adults born and raised in the United States can assume they were vaccinated for polio. Adults with increased risk of exposure to poliovirus may receive one lifetime IPV booster.
Also, adults should receive a booster dose of either Tdap or Td (a different vaccine that protects against tetanus and diphtheria but not pertussis) every 10 years, or after 5 years in the case of a severe or dirty wound or burn.