Japan will let you in without a vaccine certificate. Yellow fever vaccine is not required for entry, and it is not recommended for the trip. A week in Tokyo, Osaka, and Kyoto does not need a Japanese encephalitis jab either.
The shots that still belong on the calendar are the ones you are already supposed to have, plus hepatitis A if you will eat widely, and Japanese encephalitis only if the itinerary leaves the cities for long enough. Book that conversation at least a month before the flight. A clinic the week before departure can update flu and check measles. It cannot finish a two-dose series.
What "no vaccine required" does and does not mean
Airlines and Japanese immigration are not collecting a yellow card from Singapore tourists. That is an entry rule. It is not a health assessment.
CDC's traveler page for Japan separates three piles: routine vaccines you should already be current on, vaccines to consider because of how you will eat and where you will sleep, and vaccines that are a bad use of money for a short urban trip. The source is the CDC Japan traveler page. Singapore clinics use the same risk split even when the brand names differ.
Routine vaccines to settle before you fly
These are not Japan-specific. They are the doses that hurt you if they lapse, because measles is circulating internationally and flu moves through airports.
- MMR. Two documented doses, or a blood test showing immunity. CDC wants travelers fully vaccinated against measles at least two weeks before departure. Infants 6 to 11 months who are travelling can be offered an early measles dose. That early dose does not replace the Singapore childhood doses at 12 and 15 months.
- Influenza. Take the current season's shot if you are due. October 2026 has a stock delay. Read the eight-week rule before you accept whatever is in the fridge.
- Diphtheria, tetanus, pertussis. A booster if the last one was more than 10 years ago, or if you are going to be around infants and your pertussis dose is stale.
- Varicella and polio. Only if you never completed them.
- COVID-19. Stay current on whatever dose you are eligible for. It is not an entry stamp.
If you grew up in Singapore and finished the NCIS, measles and diphtheria are usually done. Check the National Immunisation Registry anyway. "I think I had it in school" is how people board a plane one dose short.
Hepatitis A and hepatitis B
CDC says consider hepatitis A for most travelers to Japan, and recommends it if you will eat street food or spend time in smaller cities and rural areas where food and water do the infecting. One dose before travel gives most of the short-trip protection. The second dose, six to twelve months later, is what makes it last for years. Skipping dose two is the common Singapore mistake: people treat the pre-trip jab as the whole series.
Hepatitis B is recommended for unvaccinated travelers under 60. At 60 and older it is optional. Many Singapore adults already completed hepatitis B in childhood or for work. If you have a documented series, do not repeat it for a holiday. If you do not, and you might need medical care abroad, start it. The series is not one injection.
Hepatitis A is the one to argue for on a food-heavy trip. Hepatitis B is the one to argue for if your record is empty. Neither is required at immigration.
Japanese encephalitis: the vaccine people overbuy
Japanese encephalitis virus exists across Japan, with a transmission season of about June to October. Human cases in Japan are rare. CDC still maps the risk, and it is explicit about who should pay for the vaccine.
Recommended if you are:
- Moving there to live
- Staying a month or more in areas where the virus circulates
- Going back repeatedly
Worth a discussion, not an automatic yes, if you are there under a month but will hike, camp, or stay somewhere without air-conditioning, screens, or bed nets. Also if you cannot describe your own itinerary yet.
Not recommended for a short trip that stays in major cities, or for travel outside the season.
All islands except Hokkaido have reported rare sporadic cases. "I am going to Kyoto for five days in November" is not a Japanese encephalitis itinerary. "I am cycling rural Honshu for three weeks in August and sleeping with the windows open" is.
The vaccine is two doses. CDC wants the series finished at least a week before travel. Mosquito repellent still matters after the jab. Vaccination reduces one disease. It does not make rural dusk safe.
Rabies, tick-borne encephalitis, and the shots to skip
Dogs with rabies are not a common Japanese problem, and post-exposure vaccine is generally available in the country. Pre-exposure rabies vaccine is for people who will handle animals or who will be somewhere they cannot get proper wound care and immunoglobulin quickly. A standard tourist does not need it. Buying it "to be complete" is how a travel visit turns into three appointments and a large bill.
Tick-borne encephalitis is prevented by avoiding ticks, not by a default jab on a Singapore travel menu. Yellow fever vaccine is the wrong product entirely for this destination.
GP clinic or travel clinic
A GP can give flu, update a routine booster, and tell you that you do not need Japanese encephalitis. A travel clinic earns the fee when the itinerary is rural, long, or includes children whose measles timing has to be pulled forward. The split is covered in travel clinics versus regular clinics.
Go to the travel clinic if any of these are true: more than a month on the ground, rural June to October travel, a child under 12 months, or no written record of hepatitis A or MMR. Otherwise the GP visit is enough, and you can spend the Japanese encephalitis money on the train pass.
Children need their own plan. Do not scale an adult hepatitis A decision onto a toddler. Travel vaccines for children is the companion page.
FAQ
Do I need any vaccine to enter Japan from Singapore?
Not for a typical tourist entry. Yellow fever is not required. Border rules can change. Check the airline and ICA exit notes in the week you fly, not six months of blog posts.
I am in Tokyo for 10 days and eating at restaurants. Which one shot is worth it?
Hepatitis A, if you have never had the series. Flu, if you are due. Japanese encephalitis is not that trip.
Can I get Japanese encephalitis vaccine the week I leave?
Unlikely to be useful. The series is two doses and should be finished at least a week before travel. Start a month ahead or skip it and use repellent.
I had hepatitis B as a child in Singapore. Do I repeat it?
No, if the doses are on your record. Repeat serology only if a clinic has a reason to doubt the record, not as a souvenir of the booking.
Take your immunisation record to the clinic a month out. Ask them to write down what they are not giving you, and why. A Japan trip from Singapore fails when the clinic sells a rural-Japan vaccine for a city itinerary, or when measles is one dose short and nobody looked.
