The CDC Adult Vaccine Schedule, Explained by Age

Which vaccines apply to virtually every adult, every year?

Influenza (flu). One dose annually, ideally before the end of October but beneficial whenever given during flu season 2Ref 2Centers for Disease Control and Prevention (2024).Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices — United States, 2024–25 Influenza Season.Annual flu vaccination recommended for all adults; high-dose or adjuvanted formulation preferred at 65+. The high-dose or adjuvanted formulation is preferred for adults 65 and older.

COVID-19. An updated COVID-19 vaccine is recommended for most adults annually, with additional doses for those who are immunocompromised or 65 and older — similar in structure to the annual flu shot update 1Ref 1Wodi AP, Issa AN, Moser CA, Cineas S (2025).Advisory Committee on Immunization Practices Recommended Immunization Schedule for Adults Aged 19 Years or Older — United States, 2025.Annual ACIP adult schedule covering flu, COVID-19, Tdap, hepatitis B universal recommendation through age 59, and age-stratified catch-up guidance.

Td/Tdap. Every 10 years. If you have never received Tdap as an adult, replace one Td booster with Tdap. Pregnant people receive Tdap at 27–36 weeks of every pregnancy.

What is the catch-up window for adults ages 19–26?

HPV vaccine. If you did not receive it in childhood or adolescence, ages 19–26 are the catch-up window. After 26, HPV vaccination moves to shared decision-making with a clinician (up to age 45) 3Ref 3Meites E, Szilagyi PG, Chesson HW, Unger ER, Romero JR, Markowitz LE (2019).Human Papillomavirus Vaccination for Adults: Updated Recommendations of the Advisory Committee on Immunization Practices.HPV vaccine catch-up window 19–26; shared decision-making 27–45.

Hepatitis B. A three-dose series is recommended for adults who never completed it. ACIP now recommends universal hepatitis B vaccination for all adults through age 59 regardless of risk factors 1Ref 1Wodi AP, Issa AN, Moser CA, Cineas S (2025).Advisory Committee on Immunization Practices Recommended Immunization Schedule for Adults Aged 19 Years or Older — United States, 2025.Annual ACIP adult schedule covering flu, COVID-19, Tdap, hepatitis B universal recommendation through age 59, and age-stratified catch-up guidance.

MMR and varicella. Adults born after 1956 with no evidence of immunity (no documented vaccination, no prior infection) should receive catch-up doses. Most adults born before 1957 are presumed immune to measles and mumps from childhood exposure.

Meningococcal (MenACWY). Recommended for first-year college students in dormitories, military recruits, travelers to certain regions, and those with specific immune conditions.

What vaccines matter most for adults ages 27–49?

At this stage, most routine vaccines are catch-ups for missed earlier doses. Risk-based vaccines become more prominent:

• HPV vaccine (27–45): Shared decision-making — discuss with your clinician whether it adds meaningful benefit given your history 3Ref 3Meites E, Szilagyi PG, Chesson HW, Unger ER, Romero JR, Markowitz LE (2019).Human Papillomavirus Vaccination for Adults: Updated Recommendations of the Advisory Committee on Immunization Practices.HPV vaccine catch-up window 19–26; shared decision-making 27–45.
• Hepatitis A: Two doses if you have not had it and have risk factors (travel to certain areas, liver disease, or others).
• Pneumococcal: Recommended at any age for those with certain high-risk conditions (immunocompromising conditions, chronic lung/heart/liver/kidney disease, asplenia, diabetes, smoking). Otherwise, standard pneumococcal vaccination begins at 65 4Ref 4Kobayashi M, Pilishvili T, Farrar JL, et al. (2023).Pneumococcal Vaccine for Adults Aged ≥19 Years: Recommendations of the Advisory Committee on Immunization Practices, United States, 2023.Pneumococcal vaccination universally recommended at 65; risk-based recommendation for adults 19–64 with chronic conditions, immunocompromising conditions, asplenia, or smoking.

Why does the shingles vaccine become a priority at age 50?

Shingles (Shingrix) is recommended as a two-dose series starting at age 50, given 2–6 months apart 5Ref 5Dooling KL, Guo A, Patel M, et al. (2018).Recommendations of the Advisory Committee on Immunization Practices for Use of Herpes Zoster Vaccines.Shingrix (recombinant zoster vaccine) recommended as two-dose series starting at age 50; also for immunocompromised adults. Shingrix is a recombinant, non-live vaccine and is highly effective. It is also recommended for adults under 50 who are immunocompromised.

Shingles becomes more common and more severe with age. Post-herpetic neuralgia — nerve pain that can persist for months or years — is the main complication the vaccine prevents. If you are in this age group and have not started the series, discuss it at your next routine visit.

Which vaccines become universal at age 65 and older?

Pneumococcal. All adults at 65 who have not previously received it under current guidelines should receive pneumococcal vaccination 4Ref 4Kobayashi M, Pilishvili T, Farrar JL, et al. (2023).Pneumococcal Vaccine for Adults Aged ≥19 Years: Recommendations of the Advisory Committee on Immunization Practices, United States, 2023.Pneumococcal vaccination universally recommended at 65; risk-based recommendation for adults 19–64 with chronic conditions, immunocompromising conditions, asplenia, or smoking. The specific product (PCV15, PCV20, or PPSV23) depends on vaccination history — your clinician will apply the current recommendation.

High-dose or adjuvanted flu vaccine. Preferred over standard-dose flu shots starting at 65, because the standard-dose formulation produces a weaker immune response in older adults 2Ref 2Centers for Disease Control and Prevention (2024).Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices — United States, 2024–25 Influenza Season.Annual flu vaccination recommended for all adults; high-dose or adjuvanted formulation preferred at 65+.

RSV. Routinely recommended at 75; shared decision-making at 60–74 based on health conditions 6Ref 6Melgar M, Britton A, Roper LE, Talbot HK, Long SS, Kotton CN, Havers FP (2023).Use of Respiratory Syncytial Virus Vaccines in Older Adults: Recommendations of the Advisory Committee on Immunization Practices — United States, 2023.RSV vaccine routinely recommended at 75; shared decision-making 60–74 based on individual risk factors.

Shingrix. If not yet completed, start now — shingles risk and severity rise steeply after 65 5Ref 5Dooling KL, Guo A, Patel M, et al. (2018).Recommendations of the Advisory Committee on Immunization Practices for Use of Herpes Zoster Vaccines.Shingrix (recombinant zoster vaccine) recommended as two-dose series starting at age 50; also for immunocompromised adults.

COVID-19. Adults 65 and older are a priority group for additional doses; follow current annual guidance 1Ref 1Wodi AP, Issa AN, Moser CA, Cineas S (2025).Advisory Committee on Immunization Practices Recommended Immunization Schedule for Adults Aged 19 Years or Older — United States, 2025.Annual ACIP adult schedule covering flu, COVID-19, Tdap, hepatitis B universal recommendation through age 59, and age-stratified catch-up guidance.

How do you find out what you personally still need?

The full schedule is at cdc.gov/vaccines/schedules. The CDC also offers an online Adult Immunization Scheduler that generates a personalized list based on age, conditions, and vaccine history 7Ref 7Centers for Disease Control and Prevention (2025).Adult Immunization Schedule by Age — CDC.CDC web resource for the current adult immunization schedule, including the online scheduler tool.

The most reliable path is a conversation with a primary care clinician — they can query your state's immunization registry, review your records, and generate a plan. This is worth doing at any routine visit if you are unsure where you stand.