Health Alert Issued for U.S. Travelers in Costa Rica

A new health alert dated September 25, 2026 from the U.S. Embassy in San José underscores elevated health risks for travelers in Costa Rica, focusing on recent chikungunya outbreaks around San José and ongoing mosquito borne disease activity in the northwest of the country.

Embassy Notice Follows Chikungunya Outbreaks Near San José

According to publicly available consular information, the September 25 alert builds on earlier warnings about chikungunya transmission in Costa Rica, especially in urban areas around the capital. The alert follows a sequence of health communications issued in recent weeks as local authorities documented new clusters of infection.

Information from Costa Rica’s Ministry of Health shows that on September 17, 2026, officials reported a chikungunya outbreak in several sectors of the Pavas district in San José, including Villa Esperanza, Finca San Juan, Laureles, Pavas Centro and Rohrmoser. The ministry described intensified epidemiological surveillance and mosquito control in affected neighborhoods, including thermal fogging and high power spraying operations aimed at reducing mosquito populations.

Publicly available summaries of the embassy’s earlier messages indicate that Pavas is now considered an area with locally acquired chikungunya cases. Travel health coverage notes that in one early data set from the outbreak investigation, roughly half of the people tested in Pavas were confirmed positive, with additional probable cases under review. This local context appears to be a key driver of the September 25 alert directed at U.S. citizens living in or visiting the metropolitan San José area.

The new embassy communication also comes against a broader backdrop of mosquito borne disease circulation in Costa Rica. Country reports collected by international health surveillance bodies for 2026 describe chikungunya activity in the northwest region and document thousands of dengue cases nationwide, prompting multiple agencies to place Costa Rica under enhanced mosquito disease monitoring.

Northwest Coast Remains Under Scrutiny for Mosquito Borne Disease

The September 25 embassy alert references continued concern over coastal communities where outbreaks first reappeared earlier in the year. Public information from Costa Rica’s Ministry of Health indicates that chikungunya transmission was confirmed in Playa Langosta, in the canton of Santa Cruz in Guanacaste province, during the northern summer of 2026 after several years without active circulation of the virus.

In that coastal outbreak, official ministry summaries reported a mix of confirmed and probable cases linked to Playa Langosta. Local statements noted that laboratory testing identified multiple infections among both residents and visitors, and national health authorities responded by intensifying vector control operations and public education campaigns in tourist areas.

Travel health notices compiled by international organizations now list Costa Rica as a destination with an ongoing chikungunya outbreak in its northwest region, in addition to the more recent urban cluster around Pavas in San José. These notices advise travelers to practice “enhanced precautions,” which typically means taking extra measures to avoid mosquito bites and to seek prompt medical evaluation if fever and joint pain develop.

The combination of coastal and urban transmission points explains why the embassy alert highlights risk across distinct regions of the country rather than in a single community. For travelers, this means exposure is possible both in capital area neighborhoods and in beach destinations popular with international visitors, particularly in Guanacaste.

What Travelers to Costa Rica Need to Know About Current Risks

Publicly accessible guidance from the U.S. Centers for Disease Control and Prevention describes chikungunya as a viral illness spread by Aedes mosquitoes, the same insects that transmit dengue and Zika. Typical symptoms include sudden onset of high fever, severe joint pain, headache, nausea and general fatigue. While most people recover, joint pain can be intense and, in some cases, linger for months.

Current CDC traveler information for Costa Rica notes several concurrent health concerns. Recent updates list an outbreak of chikungunya with a recommendation to practice enhanced precautions, a new hepatitis A outbreak with many cases reported in San José province, and ongoing dengue activity across multiple regions of the country. International disease surveillance reports also describe localized malaria transmission in specific cantons, though at a much lower level than the mosquito borne viral diseases.

Against this backdrop, the embassy’s September 25 notice emphasizes the importance of personal protection. Public guidance points to the use of Environmental Protection Agency registered insect repellents on exposed skin, wearing long sleeves and long trousers in mosquito prone settings, and ensuring that accommodation is equipped with window screens or air conditioning. Local health advisories from Costa Rica’s Ministry of Health also stress eliminating standing water in and around lodgings to help reduce breeding sites.

Travel health experts consistently highlight that there is currently no widely available vaccine for chikungunya in routine travel clinics and no specific antiviral treatment. Care is supportive, focusing on rest, hydration and medications for pain and fever, making prevention the central strategy for visitors and residents alike.

Implications for Itineraries, Long Stays and Cruise Calls

The September 25 health alert is not described in public reports as a restriction on travel to Costa Rica, but rather as a risk advisory. Existing U.S. travel advisories for Costa Rica continue to categorize the country as a popular tourism and business destination, while noting the presence of mosquito borne diseases and other health challenges that travelers should factor into their plans.

For short term visitors, such as vacationers headed to beach resorts in Guanacaste or the central Pacific, the main implication of the alert is the need for conscientious mosquito bite prevention. Recent traveler discussions and travel health bulletins suggest packing adequate repellent, using bed nets where screens are incomplete, and selecting lodging that offers good insect control measures, particularly during the rainy season when mosquito populations increase.

For long stay visitors, digital nomads and U.S. citizens residing in Costa Rica, the embassy alert underlines the importance of staying informed about neighborhood level health reports. In San José, for example, residents in Pavas and adjacent districts are being urged by Costa Rican health authorities to cooperate with inspections, allow fumigation crews to access courtyards and roofs, and remove containers where water can accumulate.

Cruise passengers calling at Costa Rican ports are also part of the audience for the September 25 notice. Recent cruise community postings show that health alerts linked to Playa Langosta and other coastal areas have been circulated to guests on sailings that include Guanacaste or Puntarenas. While port calls are continuing, passengers are being reminded to apply repellent before going ashore and to monitor for symptoms in the days after returning to the ship.

How to Access Care and Information While in Costa Rica

Publicly available travel health guidance stresses that visitors to Costa Rica should have medical insurance that covers care abroad and, ideally, medical evacuation. Official U.S. information notes that the government does not pay medical bills for citizens overseas, and emphasizes the importance of confirming coverage before departure.

In the event of illness consistent with chikungunya, dengue or hepatitis A during a stay in Costa Rica, travelers are advised in open source guidance to seek prompt evaluation at a local clinic or hospital. The Costa Rican health system includes both public facilities and private hospitals, particularly in San José and larger regional centers, where diagnostic testing and supportive care can be arranged. Travelers are generally encouraged to carry a list of nearby medical facilities and their insurance details in case of emergency.

The September 25 embassy alert also directs U.S. citizens, through general consular channels, to review the latest travel advisory for Costa Rica, enroll in notification programs to receive updates, and follow local health announcements from the Ministry of Health. Public information portals provide regular bulletins on outbreaks and preventive campaigns, often specifying districts, cantons and communities where intensified interventions are under way.

Given the rapidly evolving nature of mosquito borne disease outbreaks, health agencies recommend checking for updated information close to the time of travel. Reports indicate that conditions can change across a single rainy season, with new clusters emerging and others brought under control as vector management and community measures take effect.