Clinically reviewed by Dr. Pipat Finn, M.D., Senior Doctor, Doctor Pattaya. Last reviewed: September 2026
Hepatitis A spreads through contaminated food and water and is a genuine risk anywhere in Thailand, including Pattaya. A single dose of the hepatitis A vaccine protects most healthy adults within two weeks. Doctor Pattaya offers walk-in vaccination seven days a week, any time of day or night, with no appointment needed.
You are a week into your Pattaya holiday, eating well, enjoying the beach, and the last thing on your mind is a liver infection. Or maybe you have been living here in Jomtien for two years, eating street food three times a day, and you just assumed you would have caught something by now if you were going to. Either way, someone brought up hepatitis A and now you are Googling it at midnight. Good. Let us sort this out.
Hepatitis A is a liver infection spread through food and water that has been contaminated with faeces. That sounds alarming, but the reality is ordinary: a salad rinsed with tap water, ice from an unverified source, raw shellfish from a beach bar. Pattaya has all of these. Vaccination is simple, effective, and available at Doctor Pattaya without an appointment. Here is what you need to know.
Why Hepatitis A Is a Real Risk in Pattaya
Generic travel health sites tell you Thailand has a hepatitis A risk. True, but that does not tell you much. Let me be specific.
The ice that comes with every drink at an open-air bar in Naklua, the raw oysters at Jomtien Beach, a plate of somtam from a roadside stall: all of these can carry the virus if food handling falls short. And food handling is not always clean, even at places that look fine from the outside. The virus is tough. It survives temperatures that would kill most bacteria if food is not cooked all the way through.
The same conditions that cause food poisoning after a beach dinner here also create hepatitis A risk. The difference is that a bad stomach usually passes in a few days. Hepatitis A can put you in hospital for weeks.
Who Needs the Hepatitis A Vaccine in Pattaya
Short answer: almost every unvaccinated adult visiting or living here.
The CDC and WHO both recommend hepatitis A vaccination for all unvaccinated travellers to Thailand, regardless of where you stay or how careful you are with food. That applies whether you are at a resort on Pratumnak Hill or renting a flat in South Pattaya.
A few groups deserve a specific mention. If you have chronic liver disease, including hepatitis B or hepatitis C, a hepatitis A infection on top of that can be severe. Vaccination is urgent for you, not optional. If you are a man who has sex with men, hepatitis A can also spread through sexual contact, and outbreaks among MSM have been documented across Europe and Southeast Asia in recent years. This is a clinically documented transmission route, not a judgment.
Anyone living here long-term who has never been vaccinated and has no confirmed prior infection should also get checked. More on that below.
Do You Already Have Immunity? The Case for a Titer Test First
If you were born before 1980, grew up somewhere hepatitis A was common, or were vaccinated as a child and cannot remember it, you may already be immune.
A hepatitis A antibody titer test is a simple blood draw that tells us whether your immune system already has protection. Results are usually back within a day or two. If your levels are high enough, you skip the vaccine. If they are not, we proceed with the injection the same visit.
This is what I recommend for long-term Pattaya expats who are unsure of their vaccination history. It is the clinically correct approach. We run titer tests at Doctor Pattaya as part of our pre-vaccination workup when the history is unclear.
Which Hepatitis A Vaccines Are Available and What They Cost
The hepatitis A vaccines we typically stock are Havrix and Avaxim. Both are well-established and equally effective. They are given as two doses: the first now, a booster at six to twelve months. A full course gives you protection that lasts up to twenty-five years.
If you are also unvaccinated against hepatitis B, the combined hepatitis A and B vaccine, Twinrix, is often the smarter option. It covers both viruses in a single course. Given that hepatitis B is a real risk in Pattaya through sexual contact and medical procedures, many patients choose this route. You can find out more about hepatitis B exposure on our STD treatment page.
Pricing depends on which vaccine is in stock on the day. The doctor will confirm the cost before anything is administered. No surprise charges.
What If You Are Already in Pattaya Without a Vaccine
This is the situation I see most often. You forgot to get vaccinated before you flew, your GP at home said it was optional, or you simply never thought about it until a friend mentioned it over dinner.
Here is the practical reality: one dose today gives you meaningful protection within about two weeks. If you are here for a month, or moving here long-term, getting that first dose now still makes sense. The booster can happen at any clinic on your next trip, including a return visit to Pattaya.
An accelerated schedule is also possible for some patients who need faster coverage. Walk in to Doctor Pattaya any time, day or night. The consult and injection happen the same visit.
Should You Also Vaccinate Against Hepatitis B
Hepatitis A and hepatitis B both affect the liver, but they spread differently. Hepatitis A is food and water. Hepatitis B spreads through blood and sexual contact.
In Pattaya, hepatitis B exposure is a real risk. Unprotected sex, tattoos, piercings, and dental work at unregulated clinics have all been linked to hepatitis B transmission in this region. If you are unvaccinated against both, Twinrix covers you in a single course and saves time and needle sticks.
Our sexual health services at Doctor Pattaya include screening for both hepatitis A and B as part of a broader workup. If you are due for an STD screen anyway, it is worth doing both on the same day.
What Happens at the Clinic
Walk in and tell the front desk you are here for a hepatitis A vaccine. A doctor sees you first, because we do a brief consultation before any injection. We review your vaccination history, ask about any conditions that might affect suitability, and confirm which vaccine makes sense for you.
If you want a titer test done first, we arrange that at the same visit. If you are ready to vaccinate immediately, we proceed. The injection takes about thirty seconds.
We can also provide a vaccination certificate if you need one for work, a visa application, or school enrolment in Thailand. Ask at the front desk when you arrive. If you would rather not come in, we also offer hotel visits across Pattaya for patients who prefer a doctor to come to them.
Doctor Pattaya is open 24 hours a day, seven days a week, with no appointment needed. If you are in Pattaya, Jomtien, Naklua, or anywhere nearby and want a hepatitis A vaccine today, walk in or call us and we will have you seen within minutes. We also offer hotel visits if you would prefer a doctor to come to you. Same-day vaccination, vaccination certificates, and combined hepatitis A and B options are all available.
Frequently Asked Questions
Dr. Pipat Finn is the senior doctor at Doctor Pattaya Takecare Clinic, a 24/7 walk-in medical practice on South Pattaya Road, Chonburi, Thailand. They provide primary care, travel medicine, sexual health, vaccination, minor surgery, IV therapy, and emergency outpatient services for tourists, expatriates, and Pattaya residents. Languages: English and Thai. WhatsApp consultations: +66 95 073 5550. Call: +66 81 668 5557.
