Timor-Leste is malaria-free. Dengue is the mosquito risk to plan for.
- No CDC travel notice for mosquito-borne disease
The World Health Organization certified Timor-Leste malaria-free in July 2025. Dengue is endemic, and the 2025–26 rainy season brought an outbreak that peaked in February before falling back by June. Daytime repellent belongs in every month, and December to April calls for the strictest routine.
Are there mosquitoes in Timor-Leste? Yes, and dengue is the risk they bring. The World Health Organization certified the country malaria-free on July 24, 2025, and CDC lists no malaria medicine for it. Dengue is endemic and had a large outbreak in the 2025–26 rainy season, so daytime repellent belongs in every month of a trip.
The 2026 dengue outbreak
WHO's South-East Asia regional office counted 111 dengue cases in November 2025, 279 in December, 1,281 in January 2026 and 2,105 in February, when it called this "one of the largest dengue outbreaks." Cases then fell to 780 in March, 203 in April, 126 in May and 84 in June. That makes 4,579 cases from January to June 2026, against 827 in the same months of 2025. WHO's October bulletin had no figures for July to September yet. Dili's national hospital was overcrowded during the February peak.
Dili is the hotspot. A national blood survey in 2021–2023 found the highest infection pressure along the north and east coasts, with hotspots in Dili and Baucau (Nature Communications, 2026). From 2018 to 2022 Dili notified 6,234 cases, a mean of 330 per 100,000 people a year, and the 2022 peak alone brought 3,904 cases and 35 deaths (Communicable Diseases Intelligence, 2024). Of 35 Peace Corps volunteers in 2018–2019, 11 caught dengue and 8 were hospitalized and evacuated (American Journal of Tropical Medicine and Hygiene, 2021), so carry travel health and medical evacuation insurance.
The dengue mosquitoes, Aedes aegypti and Aedes albopictus, bite by day, with peaks after sunrise and in the late afternoon. Every Peace Corps volunteer surveyed in 2019 reported recent bites, 56% of them mostly at home. Put repellent on over sunscreen in the morning and again in the afternoon, and pick an air-conditioned or screened room. Our dengue & Zika routine has the schedule, and what to do after bites in a dengue zone covers the warning signs.
The same mosquitoes spread chikungunya. Timor-Leste's first recognized outbreak, in January 2024, had 195 lab-confirmed cases and none hospitalized, and CDC says chikungunya vaccination is generally not recommended. CDC's Zika page lists Timor-Leste among areas with the mosquitoes but no reported Zika cases. For Japanese encephalitis, CDC recommends the vaccine for travelers moving to an area with the disease or staying a month or more, and suggests considering it for shorter trips with rural stays, hiking or nights without screens. Ask a travel clinic 4–6 weeks before departure.
When to go
Dengue peaks in the rainy season. The 2022 outbreak was declared in January, the 2024 chikungunya outbreak came in January, and the 2026 dengue outbreak peaked in February. June to October, roughly the dry season, tends to be the easier stretch, though June 2026's 84 cases were still 14% above June 2025. December to April calls for the strictest routine. Dili needs daytime repellent in any month, and the cooler highlands around Maubisse tend to be lighter.
Where you're going
Dili
The country's dengue hotspot. The 2026 outbreak peaked here in January and February, with the national hospital overcrowded, and Dili had 88 of the 195 cases in the January 2024 chikungunya outbreak. Wear repellent from breakfast on.
Atauro Island
The diving and eco-lodge island off Dili, with a reputation for plenty of mosquitoes around open-sided beach bungalows. Lodges tend to provide bed nets, so use them, and keep the daytime dengue routine too.
Maubisse & Mount Ramelau
Cool highlands at about 4,600 feet (1,400 m) and above, where bites tend to be lighter. The neighboring Aileu highlands had the country's lowest dengue infection pressure in a 2021–2023 survey.
Baucau & the east coast
The second city, and a dengue hotspot in the 2021–2023 national survey. Keep the same daytime routine as in Dili.
Pairing Timor-Leste with Bali or Australia? Our Bali briefing covers that island's Zika notice and dengue, and our Australia briefing covers Ross River virus from Cairns south.
The Timor-Leste kit
- Picaridin 20% travel sprays: odorless in the heat and layers over sunscreen. One 3.4 oz bottle covers about a week of daily use for one person.
- A full-size backup in the checked bag. Daytime use for dengue goes through a bottle faster than evening-only spraying.
- A plug-in vaporizer for a guesthouse room without air conditioning or screens.
One rule outlasts the trip. Any fever during or after your trip means a doctor visit, and you tell them you were in Timor-Leste. Dengue usually shows up within two weeks of the bite, and in Timor-Leste it pays to get care promptly.
Traveler questions
Is there still malaria in Timor-Leste?
No. The World Health Organization certified Timor-Leste malaria-free on July 24, 2025, after cases fell from more than 223,000 clinically diagnosed in 2006 to no locally acquired cases from 2021 onward. CDC's Timor-Leste page has no malaria section and lists no malaria medicine. The yellow fever vaccine is neither recommended nor required.
Is dengue still a problem in Timor-Leste?
It is endemic, and 2026 brought a large outbreak. WHO's South-East Asia office counted 1,281 cases in January and 2,105 in February, then 84 in June, for 4,579 cases from January to June against 827 a year earlier. Its October bulletin had no figures after June yet. There is no CDC travel notice. Use repellent through the day in any month, and most strictly from December to April.
Do I need the Japanese encephalitis vaccine for Timor-Leste?
CDC recommends it for travelers moving to an area with Japanese encephalitis, spending a month or more in such areas or traveling there often. It suggests considering it for shorter trips that include rural areas, hiking or camping, or nights without air conditioning, screens or bed nets, and for travelers unsure of their plans. It is "not recommended for travelers planning short-term travel to urban areas." Take your exact route to a travel clinic 4–6 weeks before departure.
Is Atauro Island buggy?
It has that reputation. Atauro's dive resorts and eco-lodges are known for plenty of mosquitoes around open-sided bungalows, and lodges tend to provide bed nets. Use the net at night and wear repellent by day for dengue.
Sources
Health authorities, surveillance reports and news coverage of official bulletins used for this briefing, last checked October 2026. Traveler reports are linked where they appear. This page summarizes public-health guidance and is not medical advice.
- CDC destination page for travelers
- CDC Travel Health Notice
- World Health Organization
- World Health Organization
- World Health Organization
- World Health Organization
- World Health Organization
- World Health Organization
- World Health Organization
- World Health Organization
- European Centre for Disease Prevention and Control
- en.tatoli.tl
- en.tatoli.tl
- Peer-reviewed study (PubMed Central)
- Peer-reviewed study (PubMed Central)
- Peer-reviewed study (PubMed Central)
- Peer-reviewed study (PubMed Central)
- CDC Travelers' Health
- World Health Organization
- World Health Organization