Measles in Japan: Alert for expats traveling from Siem Reap

Japan, which had declared measles eliminated, is facing a resurgence of cases in 2026. According to Japanese health authorities, this increase is linked to an influx of international travelers and declining vaccination rates in certain age groups. Measles is a highly contagious disease that can lead to serious complications.

If you're planning a trip to Japan from Siem Reap, you're potentially at risk. Airports and tourist destinations are possible transmission points. Unvaccinated expats or those with only one dose of MMR (measles-mumps-rubella) vaccine face increased risk. Check your vaccination record before booking your flight.

• Check your vaccination status: two doses of MMR are recommended for optimal protection.
• If you're not up to date, consult a doctor in Siem Reap for catch-up vaccination (available at private clinics).
• During your stay in Japan, avoid crowds if you're unvaccinated and wear a mask on public transport.
• If you develop symptoms (fever, cough, rash), isolate yourself and contact a doctor.

Don't assume measles is a mild disease: it can lead to serious complications (pneumonia, encephalitis). Some travelers mistakenly believe they're protected because they had measles as a child, but vaccination remains the most reliable protection. Finally, information about local outbreaks changes quickly: consult official sources (embassy, WHO) before departure.

Japanese authorities may strengthen health controls at airports or recommend vaccination for incoming travelers. If you travel frequently in Asia, consider updating your routine vaccinations. Extra vigilance is advised for expats with young children.