Chikungunya Outbreak in Costa Rica: CDC Issues Level 2 Notice for Guanacaste Province
Costa Rica is under a CDC Level 2 travel notice, Practice Enhanced Precautions, after the Ministry of Health declared a chikungunya outbreak centered in Playa Langosta, Guanacaste province, on July 1, 2026. As of the CDC's July 16 update, Costa Rican health officials had investigated 45 suspected cases, confirming 4 and classifying 17 as probable, among both residents and foreign visitors. Chikungunya causes sudden fever and severe joint pain, and roughly 30 to 40 percent of people who catch it develop joint pain that lingers for months. It is rarely fatal. Our clinicians at Wandr recommend layered mosquito-bite prevention for every Guanacaste itinerary this summer, plus a chikungunya vaccine consultation for travelers who qualify. Start your free destination check on Wandr.
Chikungunya Outbreak in Costa Rica: CDC Issues Level 2 Notice for Guanacaste Province
By The Wandr Team | Last updated: July 22, 2026
Costa Rica is under a CDC Level 2 travel notice, Practice Enhanced Precautions, after the Ministry of Health declared an active chikungunya outbreak centered in Playa Langosta, Guanacaste province, on July 1, 2026. As of the CDC's July 16 update, Costa Rican health officials had investigated 45 suspected cases, confirming 4 and classifying 17 as probable, among both residents and foreign visitors. Chikungunya causes sudden fever and severe joint pain, and roughly 30 to 40 percent of people who catch it develop joint pain that lingers for months. It is rarely fatal. Our clinicians at Wandr recommend layered mosquito-bite prevention for every Guanacaste itinerary this summer, plus a chikungunya vaccine consultation for travelers who qualify. Start your free destination check on Wandr.
What happened in Guanacaste
On July 1, 2026, Costa Rica's Ministry of Health declared an active chikungunya outbreak after a cluster of cases surfaced in Playa Langosta, a beach town on the Guanacaste coast popular with surfers and vacationers flying into Liberia's international airport. By the time the CDC reviewed and updated its Costa Rica travel notice on July 16, health officials had investigated 45 suspected cases. Four were laboratory-confirmed and 17 were classified as probable. Cases have been reported in both Costa Rican nationals and foreign visitors.
The CDC's response was to raise Costa Rica to Level 2, Practice Enhanced Precautions, its standard designation for an active, localized outbreak that does not warrant advising against travel outright. The agency also maintains a separate, broader Watch-level notice covering chikungunya activity across Central America, a reminder that Aedes mosquitoes and the diseases they carry do not respect provincial borders.
This is a fast-moving situation. Case counts in a localized outbreak like this one typically climb for several weeks before plateauing, and the geographic footprint can expand beyond the initial cluster. We track the CDC notice and Costa Rica's Ministry of Health updates directly and adjust our pre-trip guidance as the numbers change.
What chikungunya actually is
Chikungunya is a viral illness spread by the bite of an infected Aedes aegypti or Aedes albopictus mosquito, the same species responsible for dengue and Zika. The name comes from a Makonde word describing the stooped, contorted posture that severe joint pain can produce.
Symptoms begin 3 to 7 days after the bite. The hallmark presentation is sudden high fever paired with severe, often symmetric joint pain, frequently in the hands, wrists, ankles, and knees. Headache, muscle pain, joint swelling, and a rash round out the typical picture. Most people feel sick for 7 to 10 days.
The part that catches travelers off guard is what happens after the fever breaks. Roughly 30 to 40 percent of people who contract chikungunya go on to develop a chronic phase of joint pain that can last weeks, months, or in some cases longer than a year. Older travelers and anyone with pre-existing joint disease are more likely to land in that group. Death from chikungunya is rare, with a case fatality rate below 0.1 percent, but the disability burden from chronic joint pain is real and often underestimated by travelers who assume a mosquito-borne illness means a bad week and nothing more.
Chikungunya, dengue, and Zika: same mosquito, different disease
Guanacaste, like the rest of Costa Rica, has all three Aedes-borne viruses in circulation, which is exactly why the CDC's general travel notice for Costa Rica has historically flagged dengue and Zika risk alongside this new chikungunya notice. Travelers often assume these are interchangeable "mosquito fevers." They are not.
Because all three viruses can produce fever, headache, and joint or muscle aches in the first few days, a clinician usually cannot tell them apart on symptoms alone. That is exactly why the treatment advice below matters: you manage a fever from Guanacaste conservatively until you know which virus you are dealing with.
Is Costa Rica still safe to visit?
For the large majority of travelers, yes, provided you build mosquito-bite prevention into the trip rather than treating it as optional. The CDC has not advised against nonessential travel to Costa Rica. A Level 2 notice is a call to prepare, not a call to cancel.
Lower-risk travelers, proceed with preparation:
- Healthy adults without chronic joint disease
- Travelers staying in accommodations with air conditioning or intact window screens
- Anyone willing to start a bite-prevention routine from the first day of the trip, not day three
Higher-risk travelers, book a pre-trip consult before finalizing plans:
- Pregnant travelers, especially close to delivery, given the risk of mother-to-newborn transmission around birth
- Adults 65 and older, particularly with existing joint or autoimmune conditions
- Immunocompromised travelers, for whom the chikungunya vaccine is contraindicated
- Infants under 6 months, who cannot be vaccinated against chikungunya and depend on the household's mosquito-bite discipline
- Anyone with existing chronic joint disease, since post-chikungunya arthritis can compound an existing problem
If you fall into a higher-risk group, that does not mean skip Guanacaste. It means talk to our clinicians first so we can build a plan around your specific situation rather than a generic checklist.
The prevention plan that actually works
The Aedes mosquitoes that spread chikungunya are daytime biters, most active in the early morning and late afternoon, which means the "cover up at dusk" advice built for malaria-carrying mosquitoes does not apply here. Bite prevention has to run all day.
- Repellent, applied correctly and reapplied on schedule. Use an EPA-registered repellent containing 20 to 30 percent DEET, 20 percent picaridin, IR3535, or oil of lemon eucalyptus for travelers 3 and older. Reapply every 4 to 6 hours, and always after swimming or heavy sweating, which is frequent on a Guanacaste beach trip.
- Permethrin-treated clothing. Pre-treated or spray-treated shirts, pants, and hats hold up through 5 to 6 washes and add a layer that repellent alone does not cover. Never apply permethrin directly to skin.
- Accommodation matters more than travelers think. Aedes mosquitoes breed close to homes and hotels, in anything from a bottle cap of standing water to an uncovered rain barrel. A room with air conditioning or intact screens is measurably safer than an open-air palapa near standing water.
- Empty standing water around where you are staying. Aedes larvae can develop in a forgotten water glass within 8 to 10 days. If you control the water near your room, you cut the local mosquito population that is actually biting you.
- Cover exposed skin when practical. Lightweight, long-sleeved layers in the early morning and late afternoon reduce the surface area available to bite, on top of repellent, not instead of it.
The chikungunya vaccine: what to know before you go
Two chikungunya vaccines are FDA-approved and available in the United States. Ixchiq, a live-attenuated single-dose vaccine, was approved in November 2023 for adults 18 and older. Vimkunya, a virus-like particle vaccine, was approved in February 2025 for people 12 and older, including adults over 65 who may not be ideal candidates for the live-virus option.
In Ixchiq's Phase 3 trials, 98.9 percent of recipients developed a protective antibody response within 28 days of a single dose. That 28-day window is the reason to book a vaccine appointment as soon as a Guanacaste trip is on the calendar rather than the week before departure.
Neither vaccine is a substitute for bite prevention. Both take weeks to reach full effect, and vaccination does not stop dengue or Zika, which share the same mosquito and the same beaches. The vaccine and the repellent are two layers of the same plan, not competing options.
Vaccination is not right for everyone. Pregnant travelers and anyone significantly immunocompromised should not receive Ixchiq, and older adults with comorbidities should discuss the decision with a clinician given post-marketing reports of severe reactions in that group. Our providers can review your health history and tell you which vaccine, if either, fits your trip. Book a chikungunya vaccine consultation through Wandr to get scheduled before your departure.
If you get sick during or after your trip
Fever that starts during a Guanacaste trip, or within about two weeks of getting home, deserves attention rather than a wait-and-see approach.
Use acetaminophen for fever and joint pain in the first few days. Avoid aspirin and NSAIDs like ibuprofen or naproxen until a clinician has ruled out dengue, because those medications can worsen dengue's bleeding-related complications, and you cannot tell chikungunya and dengue apart from symptoms alone in the first days of illness. Stay hydrated, since fever and reduced appetite add up quickly in a hot, humid climate.
Seek care if fever is high or persistent, if you develop bleeding or bruising, if joint pain is severe enough to limit basic movement, or if you are pregnant, an infant, or over 65. A lab test is the only reliable way to distinguish chikungunya, dengue, and Zika, and the distinction changes the treatment plan.
Building this into a full Costa Rica trip plan
An active outbreak notice is one input into a much bigger pre-trip picture, not the whole picture. Guanacaste's own dry season, road conditions, and food and water safety questions do not go away because chikungunya is the story this week. Our full Costa Rica travel health guide covers the rest of what a Costa Rica itinerary typically requires, and our seasonality breakdown for Costa Rica is worth a look if your travel dates are still flexible, since the dry season in Guanacaste runs alongside peak mosquito-avoidance conditions in different parts of the country. For a deeper look at how Ixchiq and Vimkunya compare on cost, dosing, and side effects, see our chikungunya vaccine guide for travelers.
Start your free destination check on Wandr. Tell us you are headed to Guanacaste and when, and our clinicians will build a prevention plan, review whether the chikungunya vaccine is right for you, and flag anything else your specific itinerary needs. Begin here.
Frequently asked questions
Is it safe to travel to Costa Rica right now? For most healthy travelers, yes, with real mosquito-bite precautions in place. The CDC has not advised against travel to Costa Rica. The Level 2 notice means enhanced precautions, not a warning to cancel. Pregnant travelers near delivery, infants, adults over 65 with health conditions, and anyone immunocompromised should have a pre-trip consult before booking a Guanacaste itinerary.
What is the difference between chikungunya, dengue, and Zika in Costa Rica? All three circulate in Costa Rica and spread through the same Aedes mosquitoes. Chikungunya causes severe joint pain that can persist for months. Dengue causes severe muscle pain and can progress to hemorrhagic complications in rare cases. Zika is usually mild but dangerous during pregnancy due to birth defect risk. Because symptoms overlap, only a lab test can confirm which one you have.
Is there a vaccine for chikungunya, and can I get it before my trip? Yes. Two FDA-approved chikungunya vaccines are available in the United States: Ixchiq for adults 18 and older, approved in 2023, and Vimkunya for people 12 and older, approved in 2025. Protection takes about 28 days to develop, so book the appointment as soon as your trip is confirmed. Our providers can tell you whether you qualify.
Should I take ibuprofen if I develop fever and joint pain in Costa Rica? Not right away. Because dengue circulates in the same areas and NSAIDs like ibuprofen can worsen dengue bleeding complications, use acetaminophen for fever and pain until a clinician rules out dengue. Seek medical care for any fever that develops during or shortly after a Guanacaste trip.
Which areas of Costa Rica are affected by the chikungunya outbreak? The outbreak is concentrated in Playa Langosta and the surrounding Guanacaste coast, a popular beach and surf area in the northwest of the country. The CDC notice covers the whole country at Level 2, and a broader Watch-level chikungunya notice covers Central America generally, so bite prevention matters anywhere in Costa Rica this summer, not only Guanacaste.
How long does chikungunya joint pain last? The acute illness usually resolves in 7 to 10 days. About 30 to 40 percent of people go on to develop lingering joint pain, sometimes called chronic chikungunya arthritis, that can last weeks to months and occasionally longer than a year. Older adults and people with pre-existing joint disease are more likely to develop this chronic phase.
Sources
- Centers for Disease Control and Prevention. Chikungunya in Costa Rica, Level 2 Travel Health Notice, updated July 16, 2026.
- Centers for Disease Control and Prevention. Costa Rica, Traveler View, Travelers' Health.
- Centers for Disease Control and Prevention. Chikungunya in Central America, Watch Level Travel Health Notice.
- Costa Rica Ministry of Health & Wellness, outbreak declaration for Playa Langosta, Guanacaste, July 1, 2026.
- US Food and Drug Administration, prescribing information for Ixchiq and Vimkunya chikungunya vaccines.
Medically reviewed by a licensed clinician. This article is for general education and does not replace an individual clinical assessment. Wandr Health clinicians review every traveler's health history before recommending or administering a vaccine.
Frequently Asked Questions
The Wandr Team is the editorial group at Wandr Health; every article is reviewed by a licensed clinician before publication.