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Mosquitoes in Trinidad and Tobago

Overall Risk: Low

Trinidad and Tobago has year-round mosquito activity, with peak risk during the wet season from June through December. Trinidad, with its larger land area and more varied terrain, carries higher risk than Tobago. Urban areas including Port of Spain and the east-west corridor are dengue hotspots.

Precautions

CDC recommends EPA-registered repellents containing DEET, picaridin, IR3535, or oil of lemon eucalyptus
WHO advises long-sleeved clothing and long trousers during dusk and dawn hours
WHO recommends permethrin-treated bed nets where accommodation is open-air or unscreened
WHO emphasises eliminating standing water to prevent Aedes breeding
CDC recommends intact window screens in accommodation
CDC recommends antimalarial chemoprophylaxis for travellers to malaria transmission zones

Trinidad and Tobago Mosquito Season

Trinidad and Tobago has year-round mosquito activity, with peak risk during the wet season from June through December. Trinidad, with its larger land area and more varied terrain, carries higher risk than Tobago. Urban areas including Port of Spain and the east-west corridor are dengue hotspots.

WHO and CDC surveillance reports indicate that the seasonal mosquito risk in Trinidad and Tobago aligns with rainfall patterns and temperature, with peak transmission of Trinidad and Tobago's most-reported disease (Dengue Fever) typically following the wet season. Travel timing should account for these climatic windows.

Mosquito-Borne Diseases in Trinidad and Tobago

Mozzwise tracks 6 mosquito-borne diseases in Trinidad and Tobago based on WHO, CDC, and ECDC surveillance. Each entry below cross-links to a full Mozzwise disease briefing.

Dengue Fever is recorded in Trinidad and Tobago with low severity according to current surveillance. Travelers to endemic areas, young children, pregnant women, and people with prior dengue infection. A second infection with a different serotype carries a significantly higher risk of severe disease. Reported globally in: Tropical and subtropical regions worldwide — Southeast Asia, Latin America, Sub-Saharan Africa, Pacific Islands.

Chikungunya is tracked as present in Trinidad and Tobago based on historical surveillance, though active transmission is not currently flagged. Elderly travelers, newborns, and people with chronic conditions like diabetes or heart disease. The debilitating joint pain can persist for months or years, significantly affecting quality of life. Reported globally in: Africa, Asia, Indian subcontinent, Americas. Expanding into southern Europe (Italy, France, Spain).

St. Louis Encephalitis is tracked as present in Trinidad and Tobago based on historical surveillance, though active transmission is not currently flagged. Adults over 60 traveling in the Americas during summer months. Most infections are so mild they go completely unnoticed. There is no vaccine or specific treatment. Reported globally in: Americas only — United States, Canada, Mexico, Argentina, Brazil, Caribbean.

West Nile Virus is tracked as present in Trinidad and Tobago based on historical surveillance, though active transmission is not currently flagged. Adults over 60 and immunocompromised travelers face the greatest risk of severe neuroinvasive disease. There is no vaccine and no specific treatment — taking precautions is your only protection. Reported globally in: Americas, Europe (expanding since 2010), Middle East, parts of Africa. Peak in late summer.

Yellow Fever is tracked as present in Trinidad and Tobago based on historical surveillance, though active transmission is not currently flagged. Unvaccinated travelers to Africa and South America face the highest risk. Severe cases have a 20-50% fatality rate, but the vaccine is extremely effective and widely available at travel clinics. Reported globally in: Sub-Saharan Africa and tropical South America. 47 endemic countries with vaccination requirements.

Zika Virus is tracked as present in Trinidad and Tobago based on historical surveillance, though active transmission is not currently flagged. Pregnant women and those planning pregnancy are the primary concern. The virus can cause devastating birth defects including microcephaly. Most adults recover without issues within a week. Reported globally in: Tropical Americas, Southeast Asia, Pacific Islands. Ongoing low-level transmission since the 2015-2016 epidemic.

How to Avoid Mosquito Bites in Trinidad and Tobago

Public health agencies converge on a layered approach to reducing mosquito bites in Trinidad and Tobago. The core recommendations across CDC, WHO, and ECDC are as follows.

Skin-applied repellents. CDC recommends EPA-registered repellents containing one of four tested active ingredients: DEET, picaridin, IR3535, or oil of lemon eucalyptus / para-menthane-diol. CDC advises applying sunscreen first and repellent on top, and reapplying at the interval stated on the product label.

Permethrin-treated clothing. WHO and CDC both recommend permethrin treatment of trousers, long-sleeved shirts, and socks for settings with sustained mosquito exposure. Permethrin binds to fabric and is effective against both Aedes and Anopheles species. It is not applied to skin.

Accommodation. Air-conditioned rooms with intact window screens substantially reduce indoor exposure. Bed nets — ideally permethrin-treated — are standard in open-air or budget accommodation. WHO emphasises removing standing water around accommodation, as even bottle caps, plant saucers, and water-storage containers can support Aedes breeding.

Timing. Aedes vectors active in cities and resort areas typically bite in daylight, with peaks in early morning and late afternoon. Anopheles vectors active in forested or rural areas typically bite at night.

Yellow fever vaccination is recommended by WHO for travel to Trinidad and Tobago's endemic zones, and proof of vaccination via the International Certificate may be required for entry. Confirm requirements with the destination's official guidance and a travel health clinic.

For product reviews and brand comparisons see our [travel prevention guides](/guides). Personal decisions on repellent choice, vaccination, or any prescription medication remain with a qualified travel health professional.

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More in Central America & Caribbean

Explore mosquito risk briefings for other destinations in Central America & Caribbean.

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Sources

Content on this page draws from the following sources, last verified on 2026-06-06.

Disease presence data is sourced from WHO, CDC, ECDC, and OpenDengue. Not medical advice. Personal decisions on repellents, vaccinations, or medication belong with a qualified travel health professional.

Mosquito Risk in Trinidad and Tobago | Mozzwise