Belize was certified malaria-free in 2023. The sand flies stayed.

A Belize trip can mix the cayes, the Placencia peninsula and the jungle around San Ignacio in Cayo, and each has its own biter. Towns and resorts share the day-flying Aedes mosquito that carries dengue across Central America. The beaches have sand flies, tiny midges that come out when the breeze dies. The inland forest adds a different sand fly that bites at night and can carry a skin infection. Malaria is no longer part of the picture. The World Health Organization certified Belize malaria-free in 2023.

Malaria-free, unless you cross into Guatemala

Belize reached malaria-free status in 2023, certified by the World Health Organization. The CDC's destination page for Belize lists no malaria medicine, though its general travel tips still mention malaria risk in some parts of the country. For a trip that stays in Belize, the CDC's advice comes down to preventing bites, which the dengue routine below already covers.

Tikal changes the question. The ruins are across the border in Guatemala's Petén department, and the CDC recommends malaria prevention medicine for Petén, including Tikal and Flores. It recommends the same for four more Guatemalan departments: Alta Verapaz, Baja Verapaz, Escuintla and Izabal.

Dengue is the everyday risk

Dengue is endemic in Belize, and the CDC places the country in its group with frequent or continuous dengue risk. By mid-December 2024 Belize had recorded 2,266 dengue cases, local news reported, about 23% fewer than at the same point in 2023. Toledo and Stann Creek, the district that includes Placencia, had more than half of them. In late November 2025 the San Pedro Sun reported more than 600 confirmed cases nationwide, most in the northern districts of Orange Walk and Corozal, and vector control expected more as the rains continued. In October 2026 the Pan American Health Organization reported dengue rising again in recent weeks across Central America.

The CDC Yellow Book notes that chikungunya and Zika have also been reported in Belize in recent years, though less than in Guatemala, and neither has a CDC travel notice. The CDC's Belize page says chikungunya vaccination is generally not recommended for travelers there. All three viruses spread through the same mosquito, so one routine covers them.

Aedes aegypti breeds in small pools of standing water and bites in daylight, with peaks after sunrise and before sunset. Our dengue & Zika daily routine has the full schedule. On a Belize trip it comes down to three habits.

Sand flies on the cayes and in Placencia

On Ambergris Caye, Caye Caulker and the Placencia peninsula, most of the itching comes from what Belizeans call sand flies. These are tiny biting midges, the no-see-ums, and they bite low on the legs at dawn and dusk. They are weak fliers, so a steady sea breeze keeps them grounded. On Ambergris they are rarely a problem when the wind blows and worst at dawn and dusk after a still spell, and unraked beaches tend to be worse than raked ones.

Placencia has the strongest sand-fly reputation in Belize, and it is the one stop where we rate the biting as annoying. Repellent at dawn and dusk is essential there.

Plan the beach around the wind. Spend calm dawns and dusks up on a deck or away from the sand, spray feet, ankles and calves before you walk down at sunset, and wear light long trousers to dinners at beach level. Sand flies rarely bite through fabric. Our sand-fly guide explains the insect and its schedule in detail.

Cayo, caves and forest sand flies

Inland around San Ignacio, jungle lodges, cave tubing, the ATM cave and river trips bring a second kind of sand fly. These are phlebotomine sand flies, and in Belize they can spread cutaneous leishmaniasis, a skin infection. The CDC considers it endemic in Belize and says the risk is higher for ecotourists, people who spend long hours outdoors and travelers in rustic lodging. These sand flies bite mainly from dusk to dawn, and forest and river areas tend to add mosquitoes as well.

The CDC's advice is to limit time outdoors at night in forested areas, wear protective clothing, ideally treated with permethrin, use repellent and sleep in an air-conditioned or well-screened room. Treat the clothes at home 48 hours before you fly, and they work against sand flies and mosquitoes alike. Permethrin goes on fabric, never on skin. See a doctor about any bite sore that won't heal after the trip, and mention where you were.

Where you're staying

Disease risk is lower on the cayes and at the cruise port than in Placencia and Cayo. The bite nuisance follows the wind on the coast and the forest inland. Here is how the main areas compare for a winter trip.

Winter is the drier half

Belize's rains run roughly June to November, and dengue rises with them. A December–April trip falls in the drier half of the year, when dengue pressure is lower. Early December can still be wet, with the tail of the rainy-season peak, so February to April is the lower-risk stretch.

Sand flies keep their own calendar. Calm days bring them out in any month, and on Ambergris a long-time resident rates December as much worse than August. Pack for them whenever you go.

What travelers report

Paraphrased from forum threads and reviews and linked so you can read them in full. None is dated, and individual trips vary with wind, weather and where you stay.

• Placencia · Winter

  A winter visitor bitten repeatedly on the first day asked for help; replies said the biters are sand flies, that DEET works for some people but not all, and suggested antihistamine and hydrocortisone cream. One reply said a visitor who bought a Cutter spray had no more bites, and another poster found sand flies only in Placencia, not in Corozal or Cayo. TripAdvisor ↗

• Ambergris Caye / San Pedro · Late July to early August

  Replies to a summer traveler said sand flies are rarely a problem when the wind blows and are worst at dawn and dusk after still spells; a long-time resident said they are present in August but far less bad than in December. Posters said unraked beaches north of the bridge or far south are worse, and disagreed on whether oil, Skin So Soft or DEET works best. TripAdvisor ↗

• The Lodge at Chaa Creek, San Ignacio (Cayo)

  A guest at this jungle lodge reported no bites and said mosquitoes were not too bad, though plenty of other insects turned up in the cabin. TripAdvisor ↗

• Caye Caulker

  In a thread on oil-based protection, a reply said coconut oil or baby oil both work against sand flies but coconut oil is the more common local recommendation, and that small bottles are sold in the island's grocery stores. TripAdvisor ↗

One more rule outlasts the trip. Any fever during or after your trip means a doctor visit, and you tell them you were in Belize, along with Guatemala if you went on to Tikal. Dengue usually shows up within two weeks; malaria can take longer. The travel history is what gets you the right test quickly.

Traveler questions