Vaccines for Crohn's Disease: What Patients Need to Know

If you are living with Crohn's disease, vaccines are not just the routine health chore they might have been before your diagnosis. The medications many of us rely on - biologics, immunomodulators, corticosteroids, JAK inhibitors - work by dialing down the immune system, and that changes the math on which vaccines for Crohn's disease patients are safe, which ones are urgent, and which ones you need to avoid entirely. Getting this right is one of the most practical things you can do to protect yourself, and yet it is one of the topics that slips through the cracks between your gastroenterologist's office and your primary care provider.

This article walks through the key distinctions every patient on immunosuppressive therapy should understand: live versus inactivated vaccines, the ideal timing window before starting biologics, the specific shingles risk that comes with IBD, and the conversations to have with your care team so nothing gets missed.

Key Takeaways

• People with IBD have a 1.68-fold increased risk of herpes zoster (shingles) compared with the general population (1)
• Live vaccines such as MMR, varicella, and the nasal-spray flu vaccine are contraindicated during immunosuppressive therapy (4)
• The recombinant shingles vaccine (Shingrix) is safe during immunosuppression and recommended from age 19 for immunosuppressed adults (2)
• Vaccines are most effective when given before starting biologics or immunomodulators, so review your records early (3)
• Annual inactivated influenza, pneumococcal, COVID-19, hepatitis B, and HPV vaccines should all be confirmed as current (4)

Why Vaccines Matter More When You Have Crohn's Disease

For anyone on immunosuppressive or biologic treatment, the immune system is intentionally lowered to keep Crohn's inflammation in check. That tradeoff means your body may not fight off infections as effectively as it otherwise would. Vaccine-preventable illnesses such as influenza, pneumonia, and shingles can be more severe - and sometimes dangerous - in people whose defenses are suppressed by therapy.

Crohn's disease itself also modestly raises the risk of certain infections, independent of medication. A meta-analysis of cohort studies found that people with IBD have a 1.68-fold increased risk of herpes zoster compared with people without IBD, with an incidence of 10.41 per 1,000 person-years versus 6.10 in controls (1). Add an immunosuppressive drug on top of that baseline elevation, and the case for staying current on vaccines stops being optional. It becomes a core part of your preventive care - as fundamental as colonoscopy scheduling or nutritional monitoring.

This is especially relevant if you are newly diagnosed and about to begin treatment. As we discuss in our guide to understanding life with Crohn's disease, the early months after diagnosis involve a lot of decisions, and vaccination status should be near the top of the list.

Live vs. Inactivated Vaccines: The Critical Difference

This is the single most important distinction for anyone on immunosuppressive therapy, and it is worth understanding clearly enough that you can double-check it yourself at the pharmacy or clinic.

Live vaccines to avoid on immunosuppressants

Live vaccines contain a weakened form of the virus or bacteria. In a healthy immune system, the weakened organism triggers a protective immune response without causing disease. But in a suppressed immune system, even a weakened pathogen can potentially replicate and cause real illness.

Live vaccines that are contraindicated during immunosuppressive therapy include MMR (measles, mumps, rubella), varicella (chickenpox), the older live shingles vaccine (Zostavax, which has largely been replaced), yellow fever, oral typhoid, and the nasal-spray influenza vaccine (4). These should not be given while you are on immunosuppressive drugs, and guidelines generally recommend waiting at least two months after stopping immunosuppression before receiving a live vaccine.

If your treatment plan includes a biologic or immunomodulator and you have not yet had these live vaccines, the window to get them is before therapy begins - a point we will return to below.

Inactivated and recombinant vaccines are safe

Inactivated vaccines use a killed virus, a piece of a virus, or a lab-made protein. They cannot replicate in the body and are considered safe even during full immunosuppression. This category includes the injectable flu shot, pneumococcal vaccines, hepatitis B, HPV, Tdap, COVID-19 vaccines, and the recombinant shingles vaccine (Shingrix).

One practical tip: always confirm with the person administering your vaccine that it is an inactivated formulation. This is especially relevant for influenza, where both a nasal-spray live version and an injectable inactivated version exist. The difference matters, and it is your right to ask.

Timing: Get Vaccinated Before Starting Biologics

If there is one piece of actionable advice in this article, it is this: review and update your vaccination status before you begin immunosuppressive therapy. The 2025 ECCO guidelines on opportunistic infections in IBD strongly recommend doing exactly that (3).

There are two reasons timing matters. First, live vaccines can only be given before immunosuppression starts, since they are contraindicated afterward. If you need MMR, varicella, or another live vaccine, the clock is ticking once a biologic or immunomodulator is prescribed.

Second, even inactivated vaccines produce a stronger immune response when the immune system is not yet suppressed. Pneumococcal and other vaccines are best given before starting combination immunosuppressive therapy, which significantly blunts vaccine responses (4). This does not mean vaccines are useless once you are on treatment - they are still worth getting - but the protection you build will likely be more robust if you can get them in advance.

For patients who are already on immunosuppressive therapy and have not caught up on vaccines, most inactivated vaccines can still be given. The best approach is to aim for periods of stable disease and, where possible, lower medication intensity. Your gastroenterologist can help you identify the right window. If you are on anti-TNF therapies, for example, timing vaccinations between infusion cycles is a common strategy.

The Shingles (Herpes Zoster) Vaccine and Crohn's

Shingles deserves its own section because the risk is meaningfully elevated in people with IBD, and the vaccine landscape has changed in ways that directly benefit immunosuppressed patients.

The herpes zoster virus reactivates more frequently in people whose immune defenses are lowered. For people with Crohn's disease, the incidence rate ratio for shingles is 1.67 compared with the general population (1). Medications add further risk: thiopurines (azathioprine, 6-mercaptopurine), anti-TNF agents, corticosteroids, and especially JAK inhibitors all independently raise shingles risk. The 2025 ECCO guidelines specifically highlight JAK inhibitors because of a dose-dependent relationship with shingles incidence (3).

The good news is that the current shingles vaccine - Shingrix - is a recombinant, inactivated vaccine. It is safe to receive during immunosuppression. ACIP recommends two doses of Shingrix for immunosuppressed adults aged 19 years and older, not just those 50 and over (2). This is a broader recommendation than what applies to the general population, and many patients (and some providers) are not yet aware of it.

For immunosuppressed patients, the second Shingrix dose can be given 1 to 2 months after the first, rather than the standard 2 to 6 month interval (2). This accelerated schedule helps ensure you build protection quickly, which is particularly useful if you are about to start or are already on a high-risk medication.

Other Recommended Vaccines for Crohn's Patients

Beyond shingles, several other vaccines should be on your radar, especially if you are on or about to start immunosuppressive therapy.

Influenza: An annual flu vaccine is recommended, using the injectable inactivated formulation - not the nasal spray, which is a live vaccine. Influenza can hit harder when the immune system is suppressed, and the vaccine is safe and straightforward to get each fall.

Pneumococcal: Pneumococcal vaccination is recommended for adults on immunologic therapy regardless of age, not only for those over 65 as in the general population (4). Pneumonia is a serious risk for immunosuppressed patients, and the vaccine schedule typically involves a combination of PCV (conjugate) and PPSV (polysaccharide) vaccines. Ask your provider which sequence is right for you.

COVID-19: Stay current with COVID-19 vaccination and boosters per the most recent guidelines in your country. Immunosuppressed patients may need additional doses compared with the general population. Recommendations evolve, so check with your care team at each visit.

RSV: For adults aged 60 and older, respiratory syncytial virus (RSV) vaccination is now available and worth discussing with your doctor, particularly if you are immunosuppressed.

Hepatitis B, HPV, and Tdap: These should be confirmed as up to date. Hepatitis B is especially important because some immunosuppressive therapies can reactivate latent hepatitis B infection. If your records are unclear, your doctor can check immunity through bloodwork and revaccinate if needed.

Working With Your Care Team to Stay Protected

Vaccination for Crohn's patients requires coordination, and that coordination is often the weak link. Your gastroenterologist manages your disease and prescriptions. Your primary care provider typically handles routine vaccinations. If neither one takes the lead on making sure your vaccine record accounts for your immunosuppressive therapy, things get missed.

Here are practical steps to close those gaps:

• Keep a personal vaccine record. Whether it is a paper card, a phone app, or a spreadsheet, maintain your own log and bring it to GI appointments. Do not rely solely on clinic records, which may not transfer between systems.
• Ask your GI team to review vaccines at every visit. This is especially important before starting a new biologic, switching medications, or stepping up therapy. The 2025 ECCO guidelines recommend exactly this kind of proactive review (3).
• Plan ahead for travel. Some travel vaccines - yellow fever, oral typhoid - are live and cannot be given while you are on immunosuppressive therapy. If international travel is on the horizon, start the conversation with your care team well in advance. Alternatives or medical exemption letters may be needed.
• Ask about checking immunity through bloodwork. For vaccines you may have received years ago - hepatitis B, varicella, measles - a simple blood test (titer) can tell you whether you are still protected. This is especially useful if your vaccine records are incomplete.
• Coordinate between providers. If your GI doctor recommends a vaccine, make sure your primary care office knows, and vice versa. A quick message through your patient portal can prevent months of delay.

Staying current on vaccines is not a one-time task. It is an ongoing part of living well with Crohn's, just like monitoring bloodwork or adjusting medications. The difference is that vaccines are one of the few things in this disease that are genuinely preventive - a chance to stop a problem before it starts.

Frequently Asked Questions

Are vaccines safe for Crohn's disease patients on biologics?

Inactivated and recombinant vaccines are considered safe for patients on biologics, including anti-TNF agents, vedolizumab, and ustekinumab (4). Live vaccines are not safe during immunosuppression. Always confirm that any vaccine you receive is an inactivated formulation, especially for influenza where both live and inactivated versions exist.

Can I get the shingles vaccine if I am under 50?

Yes. ACIP recommends the recombinant shingles vaccine (Shingrix) for immunosuppressed adults starting at age 19, not 50 (2). Since Crohn's patients on immunosuppressive therapy qualify, you should discuss this with your doctor regardless of your age. Many pharmacies can administer it once your provider confirms eligibility.

What happens if I already started a biologic and missed some vaccines?

Most inactivated vaccines can still be given while you are on immunosuppressive therapy. The immune response may be somewhat weaker, but vaccination is still worthwhile (4). Live vaccines, however, cannot be given until immunosuppression is stopped for an appropriate washout period. Work with your care team to catch up on inactivated vaccines as soon as possible.

Do I need a flu shot every year even with Crohn's?

Yes. The annual inactivated influenza vaccine is recommended for all Crohn's patients, especially those on immunosuppressive therapy. Influenza can be more severe in immunosuppressed individuals, and the vaccine composition changes yearly to match circulating strains. Make sure to request the injectable shot, not the nasal-spray version.

Should I get vaccinated during a flare?

There is no strict rule against receiving inactivated vaccines during a flare, but many clinicians prefer to vaccinate during periods of stable disease when the immune system is more likely to mount a good response. If you are in a severe flare and a vaccine is urgent - such as during a flu season - discuss the timing with your gastroenterologist rather than skipping it entirely.

Are COVID-19 boosters still recommended for Crohn's patients?

Immunosuppressed patients, including those with Crohn's on biologic or immunomodulator therapy, are generally recommended to stay current with COVID-19 boosters. Specific schedules vary by country and evolve as new variants emerge. Check with your care team or your national health authority for the most current guidance.

What should I ask my doctor about vaccines before starting a new medication?

Before starting any new immunosuppressive medication, ask your doctor to review your complete vaccination history. Key questions include: Am I up to date on all recommended vaccines? Do I need any live vaccines before this medication starts? Should I get Shingrix now? Are my hepatitis B and varicella titers adequate? How long after stopping my current therapy can I safely receive live vaccines if needed?

References

1. Defined, S., et al. The incidence rate of herpes zoster in inflammatory bowel disease: A meta-analysis of cohort studies. Frontiers in Medicine, 2021. Read study
2. Centers for Disease Control and Prevention. Clinical Considerations for Shingrix Use in Immunocompromised Adults Aged 19 Years and Older. 2024. Read on CDC
3. European Crohn's and Colitis Organisation. New ECCO Guidelines on Opportunistic Infections in IBD - 2025 Update. 2025. Read guidelines
4. Wasan, S., et al. Vaccination Issues in Patients with Inflammatory Bowel Disease Receiving Immunosuppression. Gut and Liver, 2012. Read study