The Ultimate Cambodia & Laos Travel Guide: 5 Things a Liverpool Pharmacist Wants You to Know Before You Fly

Cambodia and Laos get bundled together on itineraries and in vaccine advice, and up to a point that is fair — they share a river, a climate and much of the same travel-health picture. What is not fair is bundling the trips. Two nights at Angkor Wat on the end of a Thailand holiday and two months overland from Luang Prabang to the Cambodian coast are the same two countries and completely different risk assessments. Almost everything that follows turns on which of those you are doing, and the generic answer online quietly assumes the second while most people are doing the first.

**1. The Angkor add-on and the overland trip are two different appointments.**

A large proportion of the people we see for Cambodia are not really going to Cambodia. They are going to Thailand or Vietnam, and Siem Reap is a two- or three-night side trip to see the temples: hotel-based, restaurant food, minibus transfers, flying in and out. That trip is short, largely urban and comparatively well supported. Medical care in Siem Reap and Phnom Penh is far from what you would get at home, but it is reachable.

The other version is the overland one. Weeks or months moving by bus and boat, sleeping in guesthouses, eating from markets, spending time in Ratanakiri or Mondulkiri or the southern Laos provinces, perhaps volunteering, teaching or doing a placement. Longer stays mean more cumulative exposure, more remote nights, and far more time a long way from a hospital that could manage something serious.

The vaccine lists for those two trips overlap, but they do not match, and most of this guide is about where they come apart. When you book, tell us which one you are. It changes more than anything else you could tell us.

**2. Rabies: the monkeys at Angkor, the dogs everywhere else, and how far you may be from immunoglobulin.**

There are macaques around the Angkor complex and, like habituated monkeys anywhere, they are fast, unafraid and interested in food and bags. A scratch from a monkey pulling at a rucksack is a rabies exposure and needs to be treated as one. Dogs are the bigger source across both countries, and free-roaming dogs are common in towns and villages.

Both Cambodia and Laos have ongoing dog-mediated rabies, and in both, rabies immunoglobulin can be difficult to obtain outside the capitals. That is the crux of the argument for pre-exposure vaccination here. It does not make a bite safe and it does not remove the need for urgent post-exposure doses. What it removes is the requirement for immunoglobulin — the component most likely to be unavailable where you are, and most likely to force an unplanned journey to Phnom Penh, Bangkok or home.

We make the case most strongly for the overland version of this trip, for anyone spending time in the provinces, for children, for cyclists and motorbike riders, and for longer placements. For a three-night temple stop it is a genuine discussion rather than an obvious yes, and we will lay out both sides rather than push it.

Regardless of what you decide: wash any bite, scratch or lick on broken skin with soap under running water for a full fifteen minutes, apply antiseptic, and seek medical assessment that day. Do not wait and see.

**3. Japanese encephalitis here is regional and seasonal, and for a short temple trip it is usually not indicated.**

Japanese encephalitis transmission in Cambodia and Laos is tied to the lowland rice-growing areas and to the wet season, broadly May to October, peaking during and shortly after the rains. The mosquitoes that carry it bite in the evening and overnight, and the risk is rural and agricultural rather than urban.

That gives a reasonably clean decision rule. Extended stays in rural areas during the transmission season, agricultural or field work, repeated visits, or long overland travel with a lot of village and countryside nights — those are the situations where the vaccine earns its place. A short, hotel-based Siem Reap trip, particularly in the dry season, generally does not, and this is one of the vaccines we most often advise against.

We say that carefully, because Japanese encephalitis is a serious illness when it does occur and nobody should be casual about it. But adding a two-dose course to a three-night temple visit is not caution — it is a list written for a country instead of for a trip. If your plans change, or the trip stretches, come back and we will look again.

**4. Malaria here is a forest-and-border risk rather than a city risk — and the drug choice is not a formality.**

Phnom Penh, Siem Reap town, Vientiane and Luang Prabang are generally not considered malaria risk areas, and a substantial number of visitors to these two countries never leave that low-risk circuit. Risk concentrates in forested and hilly areas: the north-eastern Cambodian provinces such as Ratanakiri and Mondulkiri, the border regions, and rural southern and eastern Laos. Being outdoors at night in those areas is what changes the calculation.

If anyone recommends tablets for "Cambodia" without asking your route and your dates, that is not a risk assessment. It is the single most common thing we end up correcting in this consultation, and it usually means someone leaves without a course they were braced to pay for and take.

There is a further wrinkle that makes this region different from, say, West Africa. The Greater Mekong Subregion has documented resistance to several antimalarial drugs. That means the choice of preventive tablet for the genuinely higher-risk parts of the region is more constrained and more route-specific than elsewhere, and standby emergency treatment — carrying a treatment course to use if you develop a fever days away from a clinic — is a real and separate conversation for people going deep into the forested provinces. It is not something to order off a website. It needs a prescriber who has looked at your actual itinerary.

Whichever way it goes, the bite-avoidance advice stands: repellent at an appropriate concentration, covering up after dusk, a treated net in basic accommodation, and an absolute rule that a fever within a year of coming home is reported as travel-related, with the countries and provinces named.

**5. On the overland stretch, food, water, blood and roads all stop being abstract.**

For the long version of this trip, the things most likely to affect you are not exotic. Hepatitis A and typhoid are food- and water-borne, and weeks of market food, street stalls and guesthouse kitchens is exactly the exposure pattern they thrive on. Hepatitis A vaccination is straightforward and long-lasting once the booster is given, and we suggest it for essentially everyone. Typhoid is weighted by duration, by how rural you go, and by how you eat.

Hepatitis B moves up the list for long stays, for anyone likely to need medical or dental care while away, for tattoos and piercings, for medical and nursing electives, and for anyone whose trip might involve a new sexual partner. It is a blood-borne and body-fluid risk rather than a food one, and people tend to under-report the relevant plans. We ask neutrally, and it is not a moral question.

Cholera vaccination is not routine for tourists in this region. It becomes a real discussion for aid and relief workers, for people heading to areas with active outbreaks, or for those with particular medical conditions — another one we more often talk people out of than into.

And the unglamorous truth: road traffic injury is the leading cause of serious harm to travellers here. Night buses, overloaded minibuses, motorbike hire without a helmet or the right licence, and the slow boat down the Mekong all carry more real risk than anything else on this page. Insurance that includes medical evacuation is not optional on the overland version of this trip, because the nearest facility capable of managing major trauma may well be in another country.

**The practical bit**

Four to six weeks before departure is the comfortable lead time. Allow six to eight if your route runs through the forested provinces, if you are doing a long overland trip needing several courses, or if you may need a yellow fever centre. Yellow fever is not a disease risk in Cambodia or Laos, but a certificate can be required if you are arriving from a country with risk of transmission — for instance if this leg follows travel in parts of Africa or South America. That vaccine can only be given at a NaTHNaC-designated Yellow Fever Vaccination Centre; we will tell you if your route needs one and point you to the official register. Requirements change, so we check your exact route and stopovers at the appointment.

Bring your vaccination records including childhood doses, a printed GP summary if you can get one, your route with province names and dates, a list of your regular medicines, and details of any pregnancy, immune-suppressing treatment or long-term condition. The clinic is run by an Independent Prescriber, so if malaria prevention tablets are indicated for your route they can be assessed, prescribed and dispensed in the same visit. Same-day appointments are available with about two hours' notice, weekdays to 6pm and Saturday mornings.

This guide is written and reviewed by the pharmacists who run the clinic, against current NaTHNaC and UKHSA Green Book guidance. It is general information, not a personal recommendation — your own risk assessment happens at the consultation.

Guidance we work from

Frequently Asked Questions