Medical Oncologist
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Children in the house and live vaccines
Yes, and they should. Leaving a child unvaccinated because an adult at home is on chemotherapy creates a new risk rather than removing one. Most childhood vaccines are inactivated and raise no question. Two or three are live and need a conversation about timing, and the oral polio drop is the one needing most care.
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
Can children in the house have their vaccines?
Yes, and they should. Leaving a child unvaccinated because an adult at home is on chemotherapy creates a new risk rather than removing one: an unprotected child is more likely to bring an infection into the house, not less.
Most childhood vaccines are inactivated and raise no question at all. Two or three are live and need a conversation about timing and brief precautions. Tell your oncology team what is due, and let them say what applies.
The oral polio drop is the one that needs care
It is live, and the weakened virus passes in the child's stool for a period afterwards. In India that matters because of pulse polio campaigns where drops are given at booths and doorsteps. Ask before the campaign, not after.
This matters in joint families most of all
Where several children and a patient share a house, and nobody is quite sure whose job it is to check. One person should ask the oncology team and then tell everybody else what was said.
Tell the paediatrician that an adult in the house is on chemotherapy. It changes which product they may choose.Vaccine by vaccine
Which childhood vaccines raise a question
- Oral polio drops
- Live, and passed in the stool afterwards. The main one to raise. Ask whether the injected polio vaccine can be used instead for children in your house during this period.
- Measles, mumps and rubella
- Live, but not generally passed from a vaccinated child to a household contact. Usually given as normal. Tell your team anyway, so the decision is theirs rather than yours.
- Chickenpox vaccine
- Live. A rash can occasionally appear in the vaccinated child, and that rash is the situation to report, because chickenpox itself is dangerous during chemotherapy. Ask what to watch for.
- BCG at birth
- Live, and given to newborns. A new baby in the household is worth mentioning to your oncology team rather than working out yourselves, particularly around the injection site.
- Nasal spray flu vaccine
- Live, and the version often offered to schoolchildren. Ask the school or clinic which form they are giving and whether the injected one is available instead.
- Everything else
- The great majority of the childhood schedule is inactivated and raises no question. Do not delay those. Delay is where real harm comes from in this whole subject.
Not sure whether this applies to you?
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What to actually do
Four steps, and none of them involves skipping a child's vaccination.
Tell both doctors about each other
The paediatrician needs to know an adult at home is on chemotherapy. Your oncology team needs to know what vaccines are due. Neither will work it out without being told.
Ask the paediatrician
- Whether an injected alternative exists
- What to watch for afterwards
Ask before the campaign, not after
Pulse polio dates are announced in advance, and school programmes send notes home. That is the moment to ask, while an alternative is still possible.
Tighten handwashing for a period
Particularly after nappies and toilet visits, and particularly after oral polio drops. This is the practical protection in a household, and it is worth being strict about for a while.
Who does it
- Everyone handling the child
- The patient too, before eating
Keep the patient out of nappy duty
For a period after live oral vaccines, let somebody else change nappies and help with the toilet. A simple household arrangement that removes most of the exposure.
!
Contact the oncology team the same day for these
A child in the house has developed chickenpox, or a blistering rash after chickenpox vaccination · anyone in the house has shingles · a child has developed measles or been exposed to it · the patient has been in close contact with a child who had oral polio drops and no precautions were taken · the patient develops a fever or a rash with blisters. Do not wait for the next appointment. A fever during chemotherapy means going to the nearest emergency department the same day.
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Being straight with you
What this page cannot tell you
It cannot tell you what precautions apply in your house or for how long. That depends on the patient's treatment, the child's age, which vaccine is given and current guidance. Your oncology team and your paediatrician decide it together with your actual situation in front of them.
It also cannot tell you whether an injected polio alternative is available to you. Availability varies, and it is a question for your paediatrician rather than something to assume in either direction.
Nothing here is a reason to delay a child's vaccines
The whole point is to get the timing and the precautions right, not to leave a child unprotected. An unvaccinated child in the house is a greater risk to a patient on chemotherapy than a vaccinated one.
What to do next
Tell your paediatrician that an adult at home is on chemotherapy. Tell your oncology team which vaccines are due. Ask about the injected polio alternative before the next campaign. Tighten handwashing for a period. And take the patient off nappy duty for a while.
Commonly believed
Four beliefs that lead households the wrong way
"We should delay the children's vaccines until treatment is over."
This creates a new risk rather than removing one. An unvaccinated child is more likely to bring an infection home. The right response is to ask about timing and precautions for the two or three live vaccines, and to give the rest on schedule.
"All childhood vaccines are dangerous with a patient at home."
The great majority are inactivated and raise no question at all. Only a few are live, and of those the oral polio drop is the one that genuinely needs a household conversation. Ask rather than delaying everything.
"The paediatrician knows about the patient, surely."
They have no way of knowing unless somebody tells them, and it may change which product they choose. Say it at the appointment, and tell your oncology team what is due, in both directions.
"Pulse polio drops are given to everybody, so they must be fine."
They are a live vaccine and the weakened virus passes in the child's stool afterwards. That is a real consideration in a household with someone on chemotherapy. Ask before the campaign, while an alternative is still possible.
Questions we are asked
Common questions about children's vaccines at home
Should we stop the children's vaccinations?
No. An unvaccinated child is a greater risk to a patient on chemotherapy, not a smaller one. Tell your oncology team which vaccines are due and let them advise on timing and precautions for the live ones.
Which childhood vaccines are live?
Oral polio drops, MMR, chickenpox vaccine, BCG and the nasal spray flu vaccine. Most of the rest of the schedule is inactivated and raises no question. The oral polio drop is the one needing most care.
Can we get injected polio instead of the drops?
An injectable polio vaccine exists and is not live. Whether it is available to you is a question for your paediatrician. Ask before the next campaign rather than on the day.
What precautions apply after oral polio drops?
Ask your oncology team for specifics. In general, scrupulous handwashing after nappies and toilet visits for a period, and keeping the patient off nappy duty. The precautions are practical rather than drastic.
Is MMR a problem for the patient?
It is live but is not generally passed from a vaccinated child to a household contact, so it is usually given as normal. Tell your team anyway so the decision is theirs rather than yours.
Our child had the chickenpox vaccine and has a rash. What now?
Contact the oncology team the same day. Chickenpox is dangerous during chemotherapy and protective measures work best given promptly. Keep the child away from the patient until you have spoken to them.
There is a new baby in the house due BCG. Does that matter?
Mention it to your oncology team, since BCG is live and is given at birth. They can advise on any precautions, particularly around the injection site. Do not delay the baby's vaccination on your own judgement.
Whose job is it to check all this?
Give it to one person in the household, who asks the oncology team and then tells everyone else. In joint families this is exactly the kind of task that falls between people and never gets done.
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Sources
- Cancer Research UK — Infections and cancer treatment
- Macmillan Cancer Support — Infection and cancer treatment
- World Health Organization — Immunization coverage
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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