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The risk of bringing measles into a community rises when people travel without protection. International travel is a common way measles is introduced into countries where it had been controlled, because the virus spreads easily and can infect unvaccinated travelers. If you are unsure about your vaccination status or have never had measles, getting the MMR vaccine before leaving the country is the clearest way to lower your risk. If you think you or your child were exposed to measles, contact a healthcare provider immediately to discuss testing, treatment, and next steps.
The most effective prevention is a full series of MMR doses given on the recommended schedule. For best protection, plan to receive the recommended two doses of MMR vaccine at least two weeks before you depart on international travel. If you have only had one dose previously, get the second dose prior to travel; even if your trip is less than two weeks away, a dose may still reduce your risk and provide longer-term protection. Remember that the MMR protects against measles, mumps, and rubella all at once.
Before you go: vaccine schedules and who needs protection
Children, infants, teens, and adults have different timelines for vaccination, but the principles remain consistent: if you lack evidence of immunity, you should be vaccinated. Infants traveling internationally between 6 and 11 months should receive an early dose of MMR, followed by two routine doses at 12–15 months and again at 4–6 years. Children older than 12 months who lack proof of immunity should get a first dose immediately and a second dose at least 28 days later. Adults without documented immunity should receive at least one dose; certain adults, including healthcare workers, students, and international travelers, are recommended to receive two doses separated by a minimum of 28 days.
Acceptable proof of protection
Not everyone needs revaccination if they already have acceptable evidence of immunity. Examples of acceptable proof include written vaccination records showing adequate doses, laboratory evidence of immunity, laboratory confirmation of prior measles infection, or being born before 1957. If you cannot produce one of these, it is generally safer to be vaccinated before travel. Public health officials may also recommend extra doses or early vaccination for infants and others during an outbreak or when exposure risk is high.
After travel: monitoring, symptoms, and when to seek care
Return travelers should watch their health for up to three weeks because measles can take time to appear. Key signs are a high fever, cough, runny nose (coryza), red watery eyes (conjunctivitis), and a characteristic rash that usually begins 3–5 days after initial symptoms. If you develop a fever and rash after international travel, call your healthcare provider before going in and tell them about your trip and vaccination history. Measles is highly contagious: up to nine out of ten susceptible people who are exposed can become infected, and infected people can spread the virus from 4 days before to 4 days after a rash appears.
Post-exposure options and what to expect
If someone is exposed and lacks immunity, prompt action can reduce illness. Receiving the MMR vaccine within 72 hours of exposure may prevent disease or make illness milder, and it also supplies lasting protection. For people at high risk of severe disease, such as infants, pregnant people, or immunocompromised contacts, doctors may offer immune globulin (IG) within 6 days of exposure to provide passive protection. Vaccinated people can still develop measles in rare cases, but symptoms tend to be less severe and they are less likely to transmit the infection onward.
Practical tips: safety, access, and common concerns
The MMR and MMRV vaccines are widely available at doctors’ offices, pharmacies, community clinics, health departments, and some workplaces or schools. Most health plans cover routine doses, and the Vaccines for Children program can provide no-cost vaccines to eligible children. The vaccines are very safe; common reactions are mild and brief, such as soreness at the injection site, low fever, or a mild rash. Serious adverse events are rare. There is no credible scientific link between the MMR vaccine and autism, and nursing while vaccinated does not harm an infant.
Certain people should not receive live vaccines like MMR or should delay vaccination: those with severe, life-threatening allergies to a vaccine component, people who are pregnant, and people with significant immune suppression. If you or a family member has a recent blood transfusion, a bleeding disorder, active tuberculosis, or recent receipt of another vaccine, consult your healthcare provider about timing. When planning travel, prioritize documentation: keep vaccination records handy and, if in doubt, ask your doctor to test for immunity or provide vaccination before departure.