Medical Oncologist
Infection prevention
Vaccinations during chemotherapy
The division that matters is live versus non-live. Live vaccines contain a weakened form of the organism and are generally avoided during chemotherapy, because a suppressed immune system may not keep even a weakened version in check. Non-live vaccines do not carry that risk, though they may work less well while counts are low. Which ones and when is a decision for your oncology team.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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The short answer
Which vaccines can you have during chemotherapy?
The division that matters is live versus non-live. Live vaccines contain a weakened form of the organism and are generally avoided during chemotherapy, because a suppressed immune system may not keep even a weakened version in check. Non-live vaccines are not dangerous in that way, though they may work less well while counts are low.
Which specific vaccines you should have, and when, is a decision for your oncology team. Timing around cycles matters, and so does what your counts are doing.
The part most people miss
Vaccinating the household protects the patient. People think about what the patient can have and never about the family, and for several infections the family being protected is the more useful intervention.
Never have any vaccination, or let a household child have one, without telling your oncology team first.
!
Ask before any vaccine, and go in for these
Do not have a vaccination arranged by a general practitioner, a camp or a pharmacy without your oncology team knowing — live vaccines in particular can cause harm during treatment. If a fever develops after any vaccination, do not assume it is a normal vaccine reaction: a fever during chemotherapy is an emergency. Go to the nearest emergency department the same day, say the person is on chemotherapy, and mention the vaccine and when it was given.
Not sure whether this applies to you?
Ask an oncologistThe distinction that matters
Live and non-live vaccines
Live vaccines
Non-live vaccines
Contain a weakened form of the organism
Contain no living organism that can multiply
Generally avoided during chemotherapy
Not dangerous in the same way
Also avoided for a period after treatment ends
May be given during treatment, timing chosen by the team
Household members may need advice before having one
Household members are generally encouraged to have them
Your team will tell you which ones these are
May produce a weaker response while counts are low
Never arrange one without asking
Still ask about timing around your cycles
The household
Why vaccinating the family matters
A patient whose immune system is suppressed is protected partly by the people around them not carrying infections home. For several illnesses that is more effective than anything the patient can be given directly, because their own response to a vaccine may be poor while counts are low.
Who this applies to
Everyone living in the house, and ideally regular close visitors and anyone providing care. Children, who bring home most of what circulates, matter particularly. Ask your team which vaccines they want the household to be up to date with.
The one caution for family members
Live vaccines given to someone in the household occasionally need a short precaution — usually around avoiding close contact for a period, or care with a rash if one develops. This is uncommon and specific. Tell your team before a household child is vaccinated and say what is being given.
Do not skip a child's vaccinations
Children in the house should stay up to date rather than having their schedule abandoned out of vague worry. Leaving them unprotected is worse for everyone, including the patient. Just tell the oncology team the plan so they can advise on any live vaccine.
Keep a written note of which vaccines the household has had and when. It saves guessing later.Leave a number, we will call you
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Timing and afterwards
When vaccines are given, and revaccination later
Where a non-live vaccine is appropriate during treatment, teams usually choose a point in the cycle when counts have recovered rather than the days after chemotherapy. That gives the best chance of the vaccine actually working.
Before treatment starts is better
If chemotherapy has not begun yet, this is the moment to ask what should be given in advance. Vaccines work considerably better before the immune system is suppressed, and some cannot be given once treatment is underway.
Live vaccines stay off the list for a while afterwards
Not only during treatment but for a period after it ends, because the immune system takes time to recover. Your team will tell you when that period is over — do not assume the last cycle is the end of it.
Some people need revaccination
Certain treatments wipe out protection built up from childhood vaccinations, and a revaccination schedule is needed once recovery allows. This is particularly relevant after some intensive treatments. Ask whether it applies to you at your follow-up.
Travel vaccines need a separate conversation
Several are live, and travel plans during or soon after treatment need discussing well in advance rather than a fortnight before departure. Ask early if a trip is being considered.
Ask at your follow-up whether you need any vaccines repeating. It is easily forgotten once treatment is over.Being straight with you
What this page cannot tell you
It cannot tell you which vaccines you should or should not have, and that limit is deliberate. Which vaccine is live, which is recommended, when it should be given and how long to wait afterwards all depend on your treatment, your counts and your own history. Naming specific vaccines here would be guessing at exactly the part that has to be individual.
It also cannot tell you whether a vaccine will protect you. Response is often weaker while the immune system is suppressed, which is one of the reasons the household being protected matters as much as it does.
What to do next
Ask your oncology team which vaccines they want you to have and when, and which the household should be up to date with. If treatment has not started, ask now, because before is better than during. Tell them before any household child is vaccinated. And treat a fever after a vaccine as a fever, not as a side effect.
Questions we are asked
Common questions about vaccination
Can I have a flu vaccine during chemotherapy?
Ask your oncology team, as this is a common recommendation but the timing around cycles matters and the form given matters too. Do not simply attend a camp or a pharmacy — arrange it through the team who know your counts and your schedule.
What makes a live vaccine different?
It contains a weakened form of the organism, which relies on a working immune system to keep it in check. During chemotherapy that check is weakened, so live vaccines are generally avoided. Non-live vaccines contain nothing that can multiply and do not carry that risk.
Should my family be vaccinated?
Usually yes, and it is one of the more useful things a household can do. Protecting the people who bring infections home protects the patient, often more effectively than vaccinating the patient while their response is poor. Ask your team which ones they recommend.
My grandchild is due a vaccination. Do we delay it?
Do not abandon a child's schedule. Tell your oncology team before it is given and say what is being given — a few live vaccines come with a short precaution about close contact afterwards. Leaving a child unprotected is worse for everybody, including the patient.
Will the vaccine even work while I am on treatment?
Possibly less well than it would normally, which is why timing within the cycle is chosen carefully and why household vaccination matters. A weaker response is still a response. Your team weighs that when deciding whether and when to give one.
I have a fever after a vaccine. Is that expected?
Do not assume so during chemotherapy. A mild fever can follow some vaccines, but a fever during treatment is an emergency and cannot be distinguished at home from an infection. Go to an emergency department the same day and mention the vaccine and its date.
Do I need vaccines repeated after treatment?
Some people do, because certain treatments remove protection built up from earlier vaccination. It is particularly relevant after some intensive treatments. Ask at follow-up whether a revaccination schedule applies to you — it is easily forgotten once treatment ends.
How long after treatment before I can have a live vaccine?
Longer than the last cycle — the immune system takes time to recover, and live vaccines stay off the list through that period. Your team will tell you when it is over. Do not arrange one elsewhere on the assumption that finishing treatment ended the restriction.
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Sources
- Cancer Research UK — Vaccinations and cancer treatment
- Macmillan Cancer Support — Infection and cancer treatment
- World Health Organization — Immunization
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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