Travel Vaccines and Pregnancy — What's Safe and What Isn't
Pregnancy doesn't mean you can't travel. Millions of pregnant women fly internationally every year without incident. But it does mean the vaccine conversation gets more complicated — and in some cases, it should make you reconsider the destination rather than just the vaccines.
The core principle: live vaccines are generally avoided in pregnancy. Inactivated vaccines are generally considered safe. The nuance lies in understanding which is which, and what the risk-benefit calculation looks like for specific destinations.
Live vaccines — generally avoided
Yellow Fever is the one that most directly affects travel planning. It's a live attenuated vaccine, meaning it contains a weakened but living version of the virus. During pregnancy, live vaccines carry a theoretical risk of the vaccine virus crossing the placenta. Yellow Fever vaccination in pregnancy is not routinely recommended and is generally avoided in the first trimester.
The complication: some countries require a Yellow Fever certificate for entry. If you're pregnant and heading somewhere that mandates Yellow Fever vaccination, your options are limited. Some clinics will issue a medical exemption certificate — a document stating you cannot receive the vaccine for medical reasons — which some countries accept in lieu of the vaccination certificate. Not all do, and border enforcement is inconsistent. This is a conversation to have with your travel clinic and your obstetrician well in advance.
Other live vaccines sometimes given for travel include oral typhoid (avoid in pregnancy — use the injectable inactivated version instead) and oral cholera. Both have inactivated alternatives.
Inactivated vaccines — generally safe
Hepatitis A (inactivated), injectable Typhoid, Hepatitis B, Meningococcal vaccines — these are considered safe to administer during pregnancy when the risk of the disease outweighs the theoretical risks of vaccination. Which it often does, particularly for Hepatitis A in high-risk destinations.
Tetanus and diphtheria boosters are not only safe but often actively recommended in pregnancy in some countries — the Tdap vaccine provides protection to newborns who are too young to be vaccinated themselves.
Malaria and pregnancy
This deserves special attention. Malaria in pregnancy is significantly more dangerous than malaria outside of pregnancy — it increases the risk of miscarriage, preterm birth, low birth weight, and maternal death. The risk-benefit calculation for antimalarials in pregnancy is therefore different from the general population.
Chloroquine is considered safe in pregnancy. Atovaquone-proguanil (Malarone) is generally avoided due to insufficient safety data, particularly in the first trimester. Doxycycline is contraindicated in pregnancy. Mefloquine has been used in pregnancy, though not in the first trimester.
All of which is to say: if you're pregnant and planning to travel somewhere with significant malaria risk, this is a detailed conversation for your travel clinic and your obstetric team together, not a decision to make based on general guidance.
The broader point
Some destinations are genuinely not well-suited to travel during pregnancy — not because of vaccines specifically, but because of the combination of disease risks, limited healthcare infrastructure, and the difficulty of managing complications far from home. A two-week city trip to Tokyo while pregnant is low-risk. A month in rural West Africa during the second trimester involves a set of risk-benefit calculations that deserve careful thought.
The question isn't "can I be vaccinated" — it's "given that some vaccines I'd normally take aren't recommended, is this destination appropriate?" Your travel clinic can help you work through that, but they need to know you're pregnant before they can give you useful advice.
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