Travel Health Guide: Costa Rica (2026)
Physician's guide to staying healthy in Costa Rica: dengue prevention, traveler's diarrhea, vaccines, and what medications to pack. Updated 2026.
Travel Health Guide: Costa Rica (2026)
As a physician who has treated travelers after their Costa Rica trips, I can tell you that most people come back just fine, but the ones who don't are almost always dealing with something preventable: traveler's diarrhea from underestimating food and water risks, dengue from skipping the bug spray, or a vaccine-preventable illness they didn't know they needed. Costa Rica does not require malaria prophylaxis for the vast majority of tourist itineraries, and the tap water in San Jose and most major hotels is safe to drink. The bigger risks are dengue fever (present year-round), traveler's diarrhea (moderate risk, especially off the beaten path), and Zika virus (relevant if you're pregnant or planning to become pregnant). Pack a prescription antibiotic for traveler's diarrhea as a self-treatment backup, stay on top of your vaccines, and use DEET insect repellent consistently. This guide covers everything you need to stay healthy in Costa Rica.
Quick Facts: Costa Rica Health Overview
Overview: What Physicians See After Costa Rica Trips
Costa Rica is one of the most popular adventure travel destinations for US travelers. It draws hikers, surfers, zip-liners, and wildlife enthusiasts to its rainforests, beaches, and volcanoes. From a physician's perspective, that activity profile matters a lot: the health risks in Costa Rica are not the same as sitting at a beach resort in Cancun.
Most of my post-Costa Rica patients had one of three things: a gastrointestinal illness from food or water exposure, a dengue scare (usually a rash and fever that resolved without treatment), or an injury from an adventure activity. None of these are reasons to skip the trip. All of them are largely manageable with preparation.
The good news: Costa Rica has one of the best healthcare systems in Central America. Major hospitals in San Jose (including Hospital CIMA and Clinica Biblica) are modern, English-speaking-friendly, and excellent by regional standards. Outside the capital, care is available but more variable, which is exactly why travel insurance with emergency medical evacuation coverage makes sense.
Malaria in Costa Rica: What You Need to Know
For most US travelers visiting Costa Rica's tourist circuit, malaria prophylaxis is not recommended by the CDC. The popular destinations, including San Jose, Arenal Volcano, Manuel Antonio, Monteverde, Guanacaste, and the Osa Peninsula (Corcovado), do not have meaningful malaria transmission.
There is a theoretical low risk of malaria in remote Caribbean lowland areas (particularly the Limon province), but this is extremely uncommon among travelers. If you are planning an extended backcountry expedition in the Limon lowlands or remote jungle areas significantly off the tourist track, it may be worth discussing antimalarial prophylaxis with a physician. For 99% of Costa Rica travelers, however, you do not need malaria pills.
This does not mean you can skip mosquito protection. The same DEET you'd use for dengue prevention also reduces any residual malaria risk.
Dengue Fever: The Real Mosquito Risk in Costa Rica
Dengue is the primary mosquito-borne disease risk in Costa Rica and should not be dismissed. According to the Pan American Health Organization, Costa Rica reports thousands of dengue cases annually, with transmission occurring year-round, though it peaks during and after the rainy season (May through November).
The Aedes aegypti mosquito that spreads dengue bites primarily during daylight hours, making standard "sleep under a net at night" advice insufficient. You need daytime protection too.
How to protect yourself from dengue:
- Apply DEET-based insect repellent (at least 30% concentration) every morning and after swimming or sweating.
- Wear long sleeves and pants during early morning and late afternoon when mosquitoes are most active.
- Stay in air-conditioned or well-screened accommodations when possible.
- Eliminate standing water around your accommodation (mosquitoes breed in stagnant water).
- There is no dengue vaccine widely available for US travelers as of 2026 without prior dengue infection history.
There is no specific treatment for dengue, so prevention is everything. If you develop a high fever, severe headache, eye pain, rash, or joint pain during or after your trip, see a physician promptly. Dengue is usually self-limiting, but severe dengue requires medical monitoring.
Zika Virus in Costa Rica
Zika remains present in Costa Rica at low levels following the 2016 outbreak. For most travelers, Zika causes a mild illness (fever, rash, joint pain, red eyes) that resolves without treatment. However, Zika infection during pregnancy is linked to serious birth defects including microcephaly.
If you are pregnant or may become pregnant:
- The CDC advises pregnant travelers to consider postponing travel to Costa Rica until after delivery.
- If travel cannot be postponed, strict mosquito bite prevention is essential for the entire trip.
- Talk to your OB or a travel medicine physician before departure.
For travelers who are not pregnant, Zika is a low-level concern that does not warrant canceling the trip. Standard mosquito protection (DEET, long sleeves, screened accommodations) provides good coverage.
Traveler's Diarrhea in Costa Rica
Traveler's diarrhea is the most common illness I see after Costa Rica trips. The risk is moderate: lower than high-risk destinations like India or Kenya, but higher than Western Europe or the Caribbean cruise circuit.
Tap water in San Jose and most established tourist hotels and restaurants is treated and generally safe to drink. Water quality degrades in rural areas, smaller towns, and during heavy rain events when water systems can be overwhelmed. If you are venturing off the typical tourist path, hiking to remote waterfalls, or staying in eco-lodges in rural areas, treat water precautions seriously.
To reduce your traveler's diarrhea risk:
- Drink bottled or filtered water in rural areas and smaller towns.
- Avoid ice unless you are confident it was made from purified water.
- Eat cooked foods that are served hot.
- Be cautious with raw vegetables, salads, and fresh fruit at street stalls in rural markets.
- San Jose's grocery stores and established restaurants are generally lower risk.
Standby antibiotic treatment: This is the most important thing you can do before leaving home. Get a prescription for a traveler's diarrhea antibiotic (typically azithromycin or ciprofloxacin) before your trip to use if you develop significant diarrhea. You do not want to be sick in a remote rainforest with no access to a pharmacy for 24 hours. A physician can prescribe this during a pre-trip telemedicine visit, and Wandr ships it directly to your door.
Get a traveler's diarrhea prescription before your trip
Vaccines for Costa Rica: What You Need
Required Vaccines
Yellow fever: Costa Rica does not have yellow fever, so the vaccine is not required for entry from the US. However, if you are arriving from a country with yellow fever risk (such as some South American nations), Costa Rica may require proof of vaccination. Check your full itinerary.
Recommended Vaccines for Costa Rica
Hepatitis A: Strongly recommended for all travelers. Hepatitis A is transmitted through contaminated food and water. Costa Rica's risk is low-to-moderate, but the vaccine is safe, effective, and prevents a miserable illness that can derail your trip for weeks. The two-dose series provides lifetime immunity.
Typhoid: Recommended for travelers who plan to eat outside tourist restaurants frequently, visit rural areas, or have adventurous eating habits. The vaccine is available as an oral series or a single injection. It's not required, but I recommend it for the "pura vida" traveler who plans to eat wherever the locals eat.
Rabies (pre-exposure): Consider this vaccine if you are going to be working with animals, doing wildlife rehabilitation, or spending a lot of time in nature with potential wildlife exposure (bats are the primary concern). Adventure travelers trekking through caves or dense rainforest may also want to consider pre-exposure prophylaxis. Rabies is present in Costa Rica and, once symptoms appear, it is fatal.
Routine Vaccines to Verify Before Any International Travel
Make sure these are current before departure:
- MMR (measles-mumps-rubella): Two doses required for adults born after 1957.
- Tdap/Td (tetanus, diphtheria, pertussis): Booster every 10 years, or sooner if you have a wound risk (adventure activities increase this likelihood).
- COVID-19: Current vaccination per current guidelines.
- Influenza (flu): Annual flu shot, especially if traveling during flu season.
Book vaccine appointments online through Wandr, no calling multiple pharmacies required
Health and Safety Tips for Costa Rica
Water Safety
San Jose and major tourist areas: Tap water is treated and generally safe. That said, stomach sensitivities are individual, and switching to bottled water during your trip does no harm.
Rural areas, small towns, and eco-lodges: Use bottled or filtered water for drinking and brushing teeth. Many eco-lodges have filters, but confirm before relying on the tap.
Rivers and freshwater: Leptospirosis (a bacterial infection spread through water contaminated by animal urine) is a real risk in Costa Rica, especially after heavy rain. If you are swimming in rivers or doing white-water activities after rainfall, protect any cuts or wounds, and see a physician promptly if you develop fever, headache, or muscle pain in the weeks following.
Food Safety
Costa Rican cuisine is not inherently risky, and the local food is often excellent. Standard precautions apply:
- Eat at busy restaurants where food turns over quickly.
- Choose cooked foods served hot over cold buffet items that have been sitting out.
- Be thoughtful about raw seafood and ceviche (delicious but carries a small risk).
- Fruit from established markets and peeled in front of you is generally safe.
Mosquito Protection
Dengue, Zika, and Chikungunya all circulate in Costa Rica. DEET is your best tool. Apply it in the morning before stepping outside and reapply after swimming or sweating. Permethrin-treated clothing adds an extra layer of protection if you are going into dense jungle areas.
Sun and Heat
Costa Rica sits near the equator, and the UV index is extreme year-round. Use SPF 50 sunscreen, apply it generously and often, and stay hydrated. Heat exhaustion is a real risk during active days, especially in humid lowland areas.
Adventure Activity Safety
Costa Rica is one of the world's premier adventure destinations, and with that comes injury risk. Before any physical activity (zip-lining, surfing, white-water rafting, volcano hiking), verify that operators carry liability insurance and have safety certifications. Bring your own basic first aid supplies for hikes in remote areas. Make sure your travel insurance covers adventure activities specifically, as many standard policies exclude them.
Travel Insurance for Costa Rica: Why It Matters Here
Costa Rica is not a cheap destination to get sick in. Hospital CIMA in San Jose, where most foreign travelers with serious illness end up, costs several hundred dollars per night before procedures. More critically, medical evacuation to the US from a remote location in Costa Rica can cost $30,000 to $100,000 or more.
A comprehensive travel insurance policy with emergency medical coverage and evacuation benefits typically costs $50 to $150 for a one-to-two week trip. For an adventure-heavy Costa Rica itinerary, it is not optional in my professional opinion.
Make sure your policy covers:
- Medical expenses abroad (at least $100,000 in coverage)
- Emergency medical evacuation
- Adventure activities specifically (zip-lining, surfing, whitewater rafting)
- Trip cancellation/interruption for medical reasons
Get travel insurance through Wandr before your trip
What to Pack: Costa Rica Health Checklist
Prescription medications (get before you leave):
- Traveler's diarrhea antibiotic (azithromycin or ciprofloxacin) for self-treatment
- Motion sickness medication if taking boat tours or windy mountain roads
- Any personal prescription medications with extra supply
Over-the-counter essentials:
- DEET insect repellent (30-50% concentration)
- Sunscreen SPF 50 or higher
- Oral rehydration salts (for any GI illness)
- Antidiarrheal medication (loperamide/Imodium) for mild cases
- Anti-nausea medication
- Antihistamine (for bug reactions, allergies, or mild allergic responses)
- Blister and wound care supplies (especially for hikers)
- Antifungal cream (humidity and heat increase fungal skin risk)
- Thermometer
Documentation:
- Copies of any prescription medications you are carrying
- Travel insurance policy number and emergency contact
- Physician or travel clinic contact information for telehealth follow-up if needed
Frequently Asked Questions: Travel Health in Costa Rica
Do I need malaria pills for Costa Rica?
No. For the vast majority of travelers visiting Costa Rica's main tourist destinations, including San Jose, Arenal, Manuel Antonio, Guanacaste, Monteverde, and the Osa Peninsula, malaria prophylaxis is not recommended by the CDC. There is negligible malaria transmission in standard tourist areas. If you are planning an extended expedition in very remote Caribbean lowland jungle areas (Limon province), discuss this with a physician, but this scenario applies to fewer than 1% of Costa Rica travelers.
What vaccines do I need for Costa Rica?
No vaccines are required for entry from the US. The CDC recommends Hepatitis A for all travelers. Typhoid is recommended for travelers eating outside tourist restaurants or visiting rural areas. Rabies pre-exposure prophylaxis is worth considering for wildlife-focused itineraries or cave exploration. Ensure your routine vaccines (MMR, Tdap, flu, COVID-19) are current before any international travel.
Is the tap water safe to drink in Costa Rica?
In San Jose and major tourist areas, yes, the tap water is treated and generally safe to drink. In rural areas, small towns, and remote eco-lodges, use bottled or filtered water. When in doubt, opt for bottled water, as the cost is minimal and the peace of mind is worth it.
What is the dengue risk in Costa Rica?
Dengue fever is the primary mosquito-borne risk for Costa Rica travelers and occurs year-round, with higher transmission during the rainy season (May through November). There is no vaccine widely available for dengue prevention in US travelers (as of 2026 for those without prior dengue history). Prevention relies entirely on mosquito protection: DEET insect repellent applied daily, long-sleeved clothing, and screened or air-conditioned accommodations.
Is Costa Rica safe for pregnant travelers?
Pregnant travelers should be aware that Zika virus circulates at low levels in Costa Rica and is linked to serious birth defects. The CDC advises pregnant travelers to consider postponing travel until after delivery. If travel is necessary, strict mosquito bite prevention (DEET, long sleeves, screened accommodations) is essential throughout the trip. Discuss your specific itinerary and risk level with your OB or a travel medicine physician before departure.
Do I need to take medication for traveler's diarrhea in Costa Rica?
You do not need to take preventive antibiotics before your trip. However, I strongly recommend getting a prescription for a standby antibiotic (azithromycin or ciprofloxacin) that you carry with you and use if you develop significant diarrhea while traveling. Being sick in a remote rainforest without medication is an entirely avoidable situation. Get the prescription before you leave through a telemedicine visit, and have it on hand just in case.
How far in advance should I see a doctor before traveling to Costa Rica?
Ideally, four to six weeks before departure. This gives enough time to complete any vaccine series (Hepatitis A requires two doses spaced at least six months apart, though the first dose alone provides strong protection) and allows time to fill prescription medications. If you are within two weeks of departure, it is still worth starting the process. Wandr's telemedicine visits can be completed in 24 hours, and medications can be shipped quickly.
Does Costa Rica require travel insurance?
Costa Rica does not require travelers to have insurance as a condition of entry (some countries do). However, given the cost of private medical care, the popularity of adventure activities, and the remoteness of some destinations, travel insurance is strongly recommended. A policy with at least $100,000 in medical coverage and emergency medical evacuation coverage is appropriate for a Costa Rica adventure itinerary.
About the Author
This guide was written by Dr. Alec Freling. Wandr connects travelers with licensed physicians for telemedicine consultations, prescription travel medications shipped to your door, online vaccine appointment booking, and travel insurance, without the cost and hassle of a traditional travel clinic.
Medical Disclaimer
This guide is for general informational purposes and does not constitute individualized medical advice. Travel health recommendations depend on your specific health history, itinerary, activities planned, and current disease conditions at your destination. Disease conditions change. Always consult a licensed physician or travel medicine specialist before your trip. For the most current Costa Rica health advisories, visit the CDC Travelers' Health page for Costa Rica and the WHO International Travel and Health publication.
Sources
- Centers for Disease Control and Prevention. (2026). Costa Rica Travel Health Notice. https://wwwnc.cdc.gov/travel/destinations/traveler/none/costa-rica
- World Health Organization. (2026). International Travel and Health. https://www.who.int/ith/en/
- Pan American Health Organization. (2025). Dengue: Epidemiological Alerts and Updates. https://www.paho.org/en/topics/dengue
- Centers for Disease Control and Prevention. (2026). Dengue: Information for Travelers. https://wwwnc.cdc.gov/travel/diseases/dengue
- Centers for Disease Control and Prevention. (2026). Zika Virus: For Travelers. https://www.cdc.gov/zika/travelers/index.html
- Centers for Disease Control and Prevention. (2026). Traveler's Diarrhea. https://wwwnc.cdc.gov/travel/page/travelers-diarrhea
- Centers for Disease Control and Prevention. (2026). Leptospirosis: Information for Travelers. https://wwwnc.cdc.gov/travel/diseases/leptospirosis
- Centers for Disease Control and Prevention. (2026). Hepatitis A: Vaccination for Travelers. https://wwwnc.cdc.gov/travel/diseases/hepatitis-a