Chikungunya in Costa Rica 2026: What Travelers to Guanacaste Need to Know
If Guanacaste is on your itinerary this summer, there is something you need to know before you pack your bags. Chikungunya — a mosquito-borne virus that causes sudden fever and severe joint pain — is now circulating in the local mosquito population along Costa Rica’s popular Pacific coast, and U.S. health authorities are telling travelers to take active precautions.
On July 16, 2026, the CDC elevated its Costa Rica travel notice to Level 2 — “Practice Enhanced Precautions” — after confirming that chikungunya had established local transmission in Guanacaste Province. The U.S. Embassy in San José had already issued a formal health alert three days earlier, on July 13.
Here is what the outbreak looks like, what Level 2 actually means, and what you should do to protect your trip.
What is happening in Guanacaste?
On July 1, 2026, Costa Rica’s Ministry of Health declared an active chikungunya outbreak centered on Playa Langosta, a beach community in the Santa Cruz district of Guanacaste — a short drive from the well-known resort town of Tamarindo.
Of the 45 suspected cases initially investigated, 4 were laboratory-confirmed and 17 were classified as probable. Those infected included both Costa Rican residents and foreign visitors. By mid-July, the national case count for 2026 had risen to 21, and local health officials reported the outbreak was no longer confined to Guanacaste’s coast — cases had also been recorded in parts of Costa Rica’s Central Valley.
The phrase that health authorities keep using is “local transmission,” and it matters. It means chikungunya is now circulating in the local Aedes aegypti mosquito population — not just arriving in the bloodstream of travelers who caught it elsewhere. You do not need to have been to an affected country to be at risk. A bite from an infected local mosquito is enough.
What is chikungunya and how serious is it?
Chikungunya is a viral illness spread through the bite of the Aedes aegypti mosquito — the same insect behind dengue and Zika. The virus has been circulating globally in tropical and subtropical regions for decades, but outbreaks in high-traffic beach destinations bring it close to large numbers of travelers who may have little or no prior immunity.
Symptoms typically begin 3 to 7 days after a bite and appear suddenly:
- High fever, often above 39°C (102°F)
- Severe joint pain — the name “chikungunya” means “to walk bent over” in the Makonde language, which gives you a sense of how debilitating the joint pain can be
- Headache, muscle pain, joint swelling, and rash
Most people recover within a week. However, for a meaningful minority, joint pain can persist for months or even years after the acute infection resolves. This long-tail effect is what distinguishes chikungunya from a simple vacation stomach bug — it can follow you home.
People at higher risk for severe disease include:
- Newborns exposed around the time of birth
- Adults aged 65 and older
- People with underlying conditions such as heart disease, diabetes, or hypertension
There is no specific antiviral treatment for chikungunya. Management is supportive: rest, fluids, and pain relief.
Is there a vaccine?
Yes — and this is worth knowing. A chikungunya vaccine is available, and the CDC now recommends vaccination for eligible travelers who are visiting an area with a confirmed outbreak.
The vaccine (IXCHIQ, approved by the FDA in November 2023) is a single-dose live-attenuated vaccine recommended for adults 18 and older who are at increased risk. It requires time before your trip for the immune response to develop, so if you have Guanacaste travel planned in the next few weeks, speak with a travel medicine clinic as soon as possible.
Not everyone will qualify for the vaccine — those who are immunocompromised, pregnant, or who have certain cardiovascular conditions may be advised against it. Your travel health provider can help you weigh the options.
What does CDC Level 2 mean for your trip?
A CDC Level 2 notice is not a “do not travel” advisory. It does not mean Costa Rica is unsafe to visit. What it means is that a recognized health risk is present and the CDC is asking travelers to take steps beyond what they would normally do on a tropical vacation.
For the majority of healthy travelers, Level 2 translates to a concrete checklist — not a cancelled flight.
What CDC’s Level 2 asks you to do:
- Practice thorough and consistent mosquito bite prevention (see below)
- Consider pre-travel vaccination if you are eligible
- Be aware of symptoms and know what to do if you become ill during or after your trip
- See a doctor if you develop fever and joint pain within three weeks of returning home, and tell them where you traveled
For travelers in higher-risk groups — older adults, those with chronic conditions, or those who are pregnant — it is worth having a direct conversation with a doctor before the trip rather than after.
How to protect yourself from mosquito bites
The Aedes aegypti mosquito that carries chikungunya is a daytime biter, most active in the early morning and late afternoon. Unlike malaria-carrying mosquitoes, it does not wait for sunset to find you on the beach.
Effective precautions include:
- Use an EPA-registered insect repellent containing DEET (20–30%), picaridin, IR3535, or oil of lemon eucalyptus. Apply it to all exposed skin every time you go outside, and reapply after swimming or sweating.
- Wear long-sleeved shirts and long pants when mosquito activity is high, especially at dawn and dusk.
- Stay in accommodations with air conditioning or properly fitted window and door screens. Open-air bungalows and palapa-style rooms with gaps around doors increase your exposure.
- Use permethrin-treated clothing if you plan to spend extended time outdoors.
- Eliminate standing water around your accommodation — Aedes aegypti breeds in small containers of still water like flowerpots, buckets, and bottle caps.
- Sleep under a mosquito net if your room is not fully enclosed or air-conditioned.
Sunscreen and repellent can interact: apply sunscreen first, let it absorb, then apply repellent. Do not use combination sunscreen-repellent products — they reduce the effectiveness of both.
Should you still go to Guanacaste?
For most travelers, the answer is yes — with preparation. Level 2 advisories cover many popular destinations during seasonal disease peaks. Millions of people travel to tropical destinations under similar notices without incident, because the right precautions genuinely reduce risk.
What changes is how casually you approach mosquito prevention. A tube of DEET repellent that never left your toiletry bag on a previous trip needs to be in your hand this time, every day, twice a day.
A few additional trip-planning considerations:
- Travel insurance: Review your policy for communicable disease coverage. Most standard policies exclude trip cancellation due to an ongoing outbreak that was publicly known at the time of booking. Sitata’s built-in coverage includes real-time risk alerts and can help you track whether the situation changes while you are on the ground.
- Check the CDC advisory before you fly. The notice level could change if the outbreak escalates significantly. The CDC’s Costa Rica Travel Health Notice page is updated as new data comes in.
- Tell your doctor when you return. If you develop fever, rash, or joint pain within three weeks of coming home, mention your travel history immediately. Chikungunya is not something most primary care physicians see regularly; your travel history is a critical clue.
What if you are already there?
If you are currently in Guanacaste or planning to arrive in the coming days, the same precautions apply — start now, not when you feel a bite. If you develop a sudden high fever and joint pain, visit a local clinic or hospital and ask to be tested for chikungunya, dengue, and Zika. All three circulate in the region.
Keep Sitata alerts on. Our platform monitors WHO, CDC, and local health ministry data in real time and pushes notifications when risk levels shift in a destination you are visiting.
Sitata monitors travel health risks globally so travelers and travel managers stay informed as conditions change. Turn on destination tracking in the Sitata app for real-time alerts during your trip.
