Should You Be Worried About Dengue Fever On Your Gap Year?

Editor’s Note: This is general travel health advice and is not intended to replace individual advice from your GP, specialist nurse or another qualified travel health professional, that has been tailored to your past medical history, medication or travel plans. This article was reviewed and updated on November 2026. It is routinely reviewed every 3 years unless new clinical evidence emerges.

Dengue is something many travellers have heard of without really knowing what it is or what it could mean for their gap year. The name may be unfamiliar, or you may have heard enough unpleasant stories to question whether you should be going at all. Don’t worry. If you are planning a gap year somewhere dengue is a risk factor, it is understandable to wonder how much of a threat it poses to you and your trip, but the good news is that whilst it is unpleasant, there are lots of ways you can minimise your risk.

I caught dengue myself while travelling in India, finding out first hand why it is nicknamed breakbone fever, and it is not an experience I am keen to repeat. Between that, my background in nursing and travel medicine, and over 25 years travelling to more than 150 countries, I understand why travellers want clear answers without the scare stories or having their concerns brushed aside.

Dengue is a viral infection spread by mosquitoes. Most infections are mild or cause no symptoms, but it can make you thoroughly unwell and occasionally causes serious illness. A vaccine is now available for suitable travellers. It is not routinely recommended for everyone, but even if you don’t have it, there are still a lot of things you can do to protect yourself.

Understanding the risk and knowing what to do about it can make dengue feel much less daunting. A few sensible precautions and an awareness of when to get medical help will serve you far better than worrying about every mosquito you encounter.

Should You Worry About Dengue When You Travel?

Dengue is worth preparing for, but for most travellers it is not a reason to cancel a gap year or spend the trip worrying about mosquito bites. Most infections cause mild illness or no symptoms, and severe dengue is rare in travellers. If you do become unwell, however, it can be really unpleasant and getting assessed promptly is important.

Your risk depends on where and when you travel, how long you stay, your activities and how effectively you prevent bites. Dengue can occur in cities and popular tourist destinations as well as rural areas, so you do not need to be trekking through a jungle to encounter it.

The sensible approach is to check current advice for your destinations, use effective mosquito bite precautions during the day as well as at night, and discuss vaccination with a travel health professional where appropriate. If you have had dengue before, are pregnant or have a health condition that could increase your risk of severe illness, get tailored advice before travelling.

You cannot remove every risk from a trip, but you can reduce this one. Being informed and prepared is far more useful than being frightened.

What Is Dengue?

Dengue is an infection caused by the dengue virus and spread mainly through the bite of an infected Aedes mosquito. Aedes aegypti is the main mosquito responsible, although Aedes albopictus can also transmit it. These mosquitoes commonly bite during the day, including in the early morning and late afternoon, and can bite indoors as well as outside.

There are four main types of dengue virus, known as serotypes. Infection with one generally gives you long-term immunity to that particular serotype, but does not provide lasting protection against the other three. This means you can catch dengue more than once.

Many infections cause no symptoms. When illness does develop, it can include a fever, severe headache, pain behind the eyes, muscle and joint pain, nausea and a rash. The sometimes intense aches are behind its rather uninviting nickname, ‘breakbone fever’, although it does not actually break your bones it can feel like it is.

Dengue is a different disease from malaria. Dengue is caused by a virus, while malaria is caused by parasites, and antimalarial tablets do not protect you against it. Their symptoms can overlap, so an illness after travel needs proper assessment rather than a confident guess about which mosquito might have bitten you.

Most people recover without developing severe illness. Occasionally, dengue can cause serious complications involving leakage of fluid from blood vessels, severe bleeding or organ damage. This is known as severe dengue, and it requires urgent hospital treatment.

What Is Severe Dengue?

Severe dengue is a serious complication of dengue infection, rather than a separate strain or a different disease. It is rare in travellers, but recognising when someone is becoming more unwell matters because prompt hospital treatment can be lifesaving.

In severe dengue, blood vessels can become more permeable, allowing fluid to leak into surrounding tissues. This can reduce the amount of fluid circulating in the bloodstream and lead to shock, where the circulation cannot deliver enough blood and oxygen to the body’s organs. Severe bleeding or damage to organs such as the liver, heart or brain can also occur. Not everyone develops obvious bleeding, so its absence does not rule out serious illness.

Importantly, deterioration can happen as the fever starts to settle. A temperature returning towards normal is usually welcome, but with dengue it does not always mean the illness is over. Severe abdominal pain, persistent vomiting, fast breathing, bleeding, marked weakness or unusual restlessness need immediate medical attention.

A second dengue infection carries a higher risk of severe illness, particularly when it involves a different serotype. That does not mean a second infection will inevitably be severe, and severe dengue can also occur during a first infection. Pregnancy, older age and certain underlying health conditions can increase the risk too.

Most people with dengue do not develop these complications. Knowing the warning signs is a practical precaution, not a reason to expect the worst: if they appear, get emergency medical help rather than waiting to see whether things improve overnight.

Where Can You Catch Dengue?

Dengue occurs mainly in tropical and subtropical regions, including parts of South and South-East Asia, Central and South America, the Caribbean, Africa and the Pacific islands. That includes plenty of popular gap year destinations, rather than only remote places far from the usual backpacker trail.

Unlike the image many travellers have of mosquito-borne diseases, dengue is particularly associated with urban and semi-urban areas. The mosquitoes that transmit it can breed in small collections of water around buildings, including buckets, plant pots and discarded containers. You do not need to be standing beside a swamp or trekking through a rainforest to be exposed; a city neighbourhood or accommodation courtyard can provide suitable conditions too.

Local transmission also occurs in parts of southern Europe, particularly during warmer months. This does not mean every European destination presents the same risk as a place with sustained dengue transmission, but it does mean dengue is not exclusively a concern for long-haul tropical travel.

Risk varies within countries and throughout the year. Rainfall, temperature, mosquito populations and current outbreaks can all affect transmission, so a country’s name alone cannot tell you how likely you are to encounter it. Longer stays can increase your opportunity for exposure, but short visits are not automatically risk-free.

What Are The Symptoms Of Dengue?

Many dengue infections cause no symptoms. When illness does develop, symptoms usually begin four to ten days after the bite of an infected mosquito. You may not remember being bitten, and there does not need to be an obvious bite mark.

Dengue often begins with a sudden high temperature and can make you feel thoroughly unwell. Symptoms include:

• A high temperature.
• A severe headache.
• Pain behind the eyes.
• Muscle, bone and joint pain, sometimes intense.
• Feeling sick or vomiting.
• Swollen glands.
• A blotchy rash.

You may also feel unusually tired and weak. Not everyone gets every symptom, and the absence of a rash or the famously unpleasant ‘breakbone’ aches does not rule out dengue.

Symptoms commonly last around two to seven days, with most people recovering within one to two weeks. Fatigue can continue for several weeks afterwards, however, so feeling better does not necessarily mean being ready to resume an ambitious itinerary immediately.

The important complication is that warning signs of severe dengue can appear as the fever subsides. Severe abdominal pain, persistent vomiting, bleeding, fast breathing, marked weakness or unusual restlessness need emergency medical assessment. A falling temperature should not be taken as reassurance if you otherwise feel worse.

These symptoms can overlap with malaria and other infections. If you become unwell during or after travel in a dengue-risk area, seek prompt medical advice and explain where you have been. If malaria exposure is possible, it needs to be ruled out urgently, even if you took antimalarial tablets.

When Should You Get Medical Help?

If you develop symptoms of dengue while travelling, get medical advice promptly rather than waiting to see whether you feel better once you get home. A fever, headache and aching muscles can have several causes, and you cannot safely distinguish dengue from malaria or other infections by comparing notes with someone in your hostel.

In the UK, ask for an urgent GP appointment or contact NHS 111 if you feel unwell after visiting somewhere dengue occurs. Explain where you travelled, when you returned and when your symptoms began. Mention any previous dengue infection and any medicines you are taking. If you also visited a malaria-risk area, make that clear: malaria needs to be considered urgently, even if you took antimalarials.

When To Get Emergency Help

Get emergency medical help if you develop warning signs of severe dengue, including:

• Severe abdominal pain.
• Persistent vomiting.
• Fast breathing or difficulty breathing.
• Bleeding from your nose or gums.
• Blood in your vomit or stools.
• Extreme weakness or tiredness, particularly if you are deteriorating.
• Unusual restlessness.
• Fainting, collapse or cold, pale, clammy skin.

In the UK, call 999 or go to A&E. Abroad, contact the local emergency service or get to a hospital immediately. Do not wait overnight, continue to your next destination or assume you are recovering because your temperature has started to fall.

These complications are uncommon in travellers, and most people recover without developing severe dengue. The point is to recognise when prompt assessment becomes an emergency, so that anyone who does become seriously unwell can receive treatment without delay.

How Is Dengue Treated?

There is no specific antiviral treatment for dengue, but that does not mean nothing can be done. Treatment supports your recovery, relieves symptoms and, where necessary, manages complications. Most people recover without hospital treatment, while severe dengue needs urgent care in hospital.

If you suspect dengue, get medical advice rather than diagnosing it yourself. Once assessed, you may be advised to recover at your accommodation, with instructions about follow-up and the symptoms that mean you need to return for help.

Rest And Keep Up Your Fluids

Rest and drink fluids regularly. Fever, vomiting and reduced appetite can make it harder to stay hydrated, so small, frequent drinks may be easier to manage than trying to drink a large amount at once. Oral rehydration solution can help replace fluid and salts if you are losing them through vomiting.

If you cannot keep fluids down, are passing much less urine or feel increasingly dizzy or weak, seek medical advice promptly. Persistent vomiting, severe abdominal pain or other warning signs need emergency assessment rather than another attempt to sleep it off.

Give yourself time to recover. Most people feel better within one to two weeks, but fatigue can last longer. Rearranging a few travel plans is considerably more sensible than dragging yourself onto an overnight bus while you are still unwell.

Use Suitable Pain Relief

Paracetamol can help relieve pain and reduce fever if it is suitable for you. Follow the packet instructions or your clinician’s advice, and check other medicines you take so you do not accidentally double up on paracetamol.

Avoid ibuprofen, aspirin and other non-steroidal anti-inflammatory drugs when dengue is suspected or confirmed because they can increase the risk of bleeding. If you already take prescribed aspirin, anticoagulants or another medicine affecting bleeding, get prompt medical advice about how to manage it rather than changing the prescription yourself.

Antibiotics do not treat the dengue virus. They may be needed if a clinician identifies a separate bacterial infection, but they are not a way to speed up an uncomplicated dengue recovery.

Hospital Treatment For Severe Dengue

Severe dengue requires close monitoring and carefully managed treatment. This may include intravenous fluids, blood tests and support for bleeding, shock or organ complications. Fluid treatment needs particular care, so trying to manage severe symptoms yourself is not a safe alternative.

Early recognition and appropriate care greatly improve outcomes. If you feel markedly worse as your fever settles, or develop any warning signs, get emergency help even if you have already been assessed earlier in the illness.

Can You Get Dengue More Than Once?

Yes. There are four main dengue virus serotypes, and infection with one generally gives you long-term immunity to that particular type. It does not give you lasting protection against the other three, so having recovered from dengue once does not mean you can stop taking precautions.

A subsequent infection, particularly with a different serotype, carries a higher risk of severe dengue. This is partly because the immune response from an earlier infection can sometimes help a different serotype infect cells rather than protect against it, a process known as antibody-dependent enhancement.

That needs putting into perspective. A second infection does not inevitably become severe, and severe dengue remains rare in travellers. It can also occur during a first infection, so neither your previous experience nor the absence of one can reliably predict how a future illness will develop.

Having had dengue myself in India, I have no particular desire to repeat the experience. But previous infection is a reason to get tailored advice and take prevention seriously, rather than assume future travel is off the table.

Tell your travel health professional about any confirmed or suspected previous dengue, including when it happened and whether you have test results. That history matters when assessing your risk and discussing whether dengue vaccination would be appropriate for your next trip.

Is There A Vaccine For Dengue?

Yes. Qdenga is available privately in the UK for suitable travellers aged four years and over. It provides another way to reduce the risk of dengue, but it is not routinely recommended for everyone visiting a country where dengue occurs.

Whether it is appropriate depends on your previous dengue history, destination, likely exposure and medical circumstances. Being licensed for an age group does not mean everyone in that group should automatically receive it.

Who Should Consider Dengue Vaccination?

UK guidance generally supports considering vaccination for people with a confirmed or likely previous dengue infection who are travelling somewhere with a recognised dengue risk. Previous infection matters because a subsequent infection can carry a higher risk of severe disease.

Tell your travel health professional about any previous diagnosis, relevant blood tests or illness suspected to have been dengue. Tests for past infection are not always conclusive, so interpreting your history may require more than arranging a blood test and treating the result as a straightforward yes or no.

Vaccination can also be considered for people who have not previously had dengue. Current UK guidance recommends discussing these cases with a travel health clinician experienced in assessing Qdenga’s potential benefits and risks. Evidence is less certain for some dengue serotypes in people without previous infection, so this needs an individual discussion rather than a blanket recommendation.

Your itinerary matters too. A prolonged stay somewhere with sustained transmission or an ongoing outbreak presents a different decision from a brief visit to an area where only sporadic local cases have occurred.

How Many Doses Do You Need?

The course consists of two injections given three months apart, so raise the question early when planning your trip. If departure is approaching or you cannot complete the course before travelling, ask for individual advice rather than assuming one dose provides equivalent protection.

Vaccination does not guarantee that you will avoid dengue, and you still need mosquito bite precautions after completing the course.

Who Cannot Have Qdenga?

Qdenga is a live vaccine and must not be given during pregnancy or breastfeeding, or to people with certain forms of immune suppression. It is not suitable for children under four or anyone who has had a severe allergic reaction to a previous dose or a relevant vaccine component.

Pregnancy should be avoided for at least one month after vaccination. Discuss any pregnancy plans, medical conditions and medicines with the clinician assessing you so they can establish whether the vaccine is suitable.

For the right traveller, vaccination can be a worthwhile additional precaution. The aim is to establish whether it offers a useful benefit for your circumstances, alongside the bite prevention you should already be using.

How To Reduce Your Risk Of Dengue

Preventing mosquito bites remains important whether or not you have been vaccinated. The mosquitoes that transmit dengue commonly bite during the day and can feed indoors as well as outside, so saving your repellent for the evening leaves a fairly substantial gap in your protection.

You do not need to spend your trip hiding from mosquitoes. A few consistent habits can reduce your exposure while you get on with exploring.

Use An Effective Mosquito Repellent

A repellent containing 50% DEET is the UK first choice for travellers. Effective alternatives include 20% icaridin, also called picaridin, properly formulated PMD-based repellents and IR3535. Choose a suitable product and follow its instructions, including any age restrictions and limits on application.

Apply it evenly to exposed skin where protection is needed. Sweating, swimming and rubbing can shorten protection, so reassess after those activities rather than assuming the advertised duration is guaranteed. If you are also using sunscreen, apply sunscreen first, allow it to dry and then apply repellent.

Avoid your eyes, mouth, cuts and irritated skin. For your face, apply repellent to your hands first rather than spraying directly towards it, and wash your hands afterwards.

Cover Exposed Skin Where Practical

Loose-fitting, breathable clothing with long sleeves and long trousers can reduce the amount of skin available to bite. You can also use appropriately treated clothing containing an insecticide such as permethrin, following the manufacturer’s instructions.

You do not need to dress for an Arctic expedition in tropical heat. Choose comfortable clothing you will actually wear, and use repellent on the skin that remains exposed. Clothing treatments are an additional precaution; permethrin should never be applied directly to your skin.

Check Your Accommodation

Effective window and door screens help keep mosquitoes out, while functioning air conditioning can also reduce the likelihood of bites. Keep doors and windows closed where appropriate, and check screens for gaps rather than assuming the presence of a mesh panel means the job is done.

Use an insecticide-treated mosquito net if your sleeping space is not adequately protected, including when sleeping during the day. Check for holes and tuck the net securely under the mattress, keeping it away from your skin.

If you are staying somewhere for a while, empty unnecessary standing water from containers around the accommodation where practical. Dengue-transmitting mosquitoes can breed in surprisingly small collections of water, including plant-pot saucers and discarded buckets.

Check Advice For Your Actual Route

Look at current destination guidance and outbreak information before travelling, and check again if your itinerary changes. Discuss vaccination and any factors that could increase your risk of severe illness with a travel health professional.

Antimalarial tablets do not prevent dengue, and previous dengue infection does not remove the need for precautions. Neither do repellent wristbands, garlic supplements or an optimistic belief that mosquitoes usually prefer someone else. Reliable products and consistent use will serve you considerably better.

Be Prepared, Then Enjoy Your Trip

Dengue deserves a place in your travel preparations, but it does not need to overshadow your gap year. Most infections are mild or cause no symptoms, severe dengue is rare in travellers, and there are practical steps you can take to reduce your risk.

Check the advice for your destinations, make bite prevention a daily habit and discuss vaccination if it may be appropriate for you. If you become unwell, get assessed promptly and make sure the clinician knows where you have travelled. Recognising when you need help is just as useful as knowing what to pack.

Having had dengue in India, I would happily have skipped that particular experience. It has not stopped me travelling, though, and understanding the risks should help you make sensible decisions rather than leave you afraid to explore.

Prepare properly, give yourself time to recover if illness does interrupt your plans, and enjoy the places you have come to see. Your gap year should be remembered for the experiences, not spent worrying about every mosquito that buzzes in your ear.