The Revised Dengue Destination List
Two mosquito-borne travel notices moved on the same day, and one of them changed which countries American travelers are being told to watch.
The CDC Travel Health Notices page now shows the Global Dengue notice updated July 30, 2026, with a destination list naming Colombia, Samoa, Vietnam, New Caledonia, the Maldives, Bolivia, Tonga, Cambodia, Kenya, Malaysia, and Sri Lanka. The notice describes dengue as a year-round risk in many parts of the world, with outbreaks commonly occurring every two to five years.
That list looks materially different from the one CDC published in late January, which named Afghanistan, Bangladesh, Colombia, the Cook Islands, Cuba, Mali, Mauritania, Nicaragua, Samoa, Sudan, and Vietnam. Only Colombia, Samoa, and Vietnam appear on both. Cuba, which accounted for a large share of travel-associated dengue among returning U.S. travelers in recent years, is no longer named.
On the same date, CDC updated its chikungunya notice covering northwest Costa Rica. That notice sits at Level 2, Practice Enhanced Precautions, and describes an outbreak in the country's northwest. MedicalDaily previously reported on the Level 2 chikungunya notice for Guanacaste Province, where most cases have been reported in the beach community of Playa Langosta.
A destination dropping off a list is not the same as risk disappearing. CDC's areas with risk of dengue classification are a separate, slower-moving map of where the virus circulates continuously.
Two Viruses That Look Alike at the Start
Both are spread by Aedes mosquitoes, which bite during daylight hours rather than only at dusk. Both start with fever. The courses diverge from there, and the difference matters for anyone deciding whether to call a doctor from a hotel room.
Chikungunya symptoms typically begin three to seven days after an infected bite. The signature is severe joint pain, often in the hands and feet, alongside fever, headache, muscle pain, joint swelling, and rash. Most people recover within about a week. A subset develops joint pain that persists for months or longer. Deaths are rare, though newborns, adults 65 and older, and people with conditions such as diabetes or heart disease face higher risk of severe illness.
Dengue also opens with fever, headache, and body aches, but the pattern to watch is different. The dangerous window in dengue tends to arrive as the fever breaks, not at its peak, and warning signs include severe abdominal pain, persistent vomiting, bleeding gums or nose, and unusual fatigue or restlessness.
For dengue, a second infection with a different serotype carries higher risk of severe disease than a first. That is why prior dengue history is worth mentioning to a clinician.
Notice Levels Are Precautions, Not Bans
CDC currently lists no destinations at Level 4, Avoid All Travel, and none at Level 3 for either of these viruses. That distinction gets lost in aggregated coverage.
Level 1 means practice usual precautions. Level 2 means practice enhanced precautions. Neither restricts travel. Neither cancels anything. They tell travelers what protective steps the agency recommends for a specific destination, and they exist because surveillance detected higher than expected case counts or more infections among returning travelers.
The vaccine picture for chikungunya has narrowed in the United States and is worth checking rather than assuming. FDA suspended the license for the live-attenuated vaccine Ixchiq on August 22, 2025, stating in its safety communication that the product "does not have benefits outweighing risks, under most plausible scenarios." The manufacturer subsequently withdrew its U.S. application. A separate virus-like particle vaccine, Vimkunya, remains licensed for people 12 and older, and CDC maintains clinical guidance on who should be considered for it.
There is no widely recommended dengue vaccine for most U.S. travelers, and no specific antiviral for either infection. Prevention is bite avoidance.
Travelers Facing the Highest Stakes
Risk is not evenly distributed across a plane cabin.
Pregnant travelers warrant specific attention. CDC advises that pregnant travelers reconsider travel to areas with chikungunya outbreaks, particularly close to delivery, because a mother infected around the time of birth can transmit the virus to the newborn, who is then at risk of severe illness.
Older adults and people with diabetes, heart disease, or weakened immune systems face higher odds of severe outcomes from chikungunya. Travelers with a prior dengue infection face a higher risk of a subsequent infection. Families visiting relatives abroad, who often stay in residential neighborhoods for longer stretches without air conditioning or window screens, generally accumulate more exposure than resort guests.
The practical protections are unglamorous and effective. Insect repellent registered with the Environmental Protection Agency, containing DEET, picaridin, IR3535, or oil of lemon eucalyptus, applied per label directions. Long sleeves and long pants during daylight hours. Accommodations with air conditioning or intact screens. Permethrin-treated clothing for longer stays.
Steps Before Booking and After Returning
Travelers can check the destination page on the CDC travel site before departure rather than relying on a notice they read weeks earlier. Notice lists move.
A travel medicine visit four to six weeks before departure is the window in which vaccine and prophylaxis decisions can still be made. That timing is often missed.
After returning, the relevant number is 14 days. Fever developing within two weeks of return from an area with dengue or chikungunya risk warrants a call to a clinician, and the travel history should be stated up front so the right tests are ordered. Dengue is diagnosed by blood test, and the diagnosis is frequently delayed when travel is not mentioned.
Anyone who develops severe abdominal pain, repeated vomiting, bleeding, difficulty breathing, or rapid deterioration after travel needs urgent evaluation rather than a next-available appointment.
CDC updates these notices as surveillance data arrive, without a fixed schedule. Destination lists may expand or contract again before the end of summer. MedicalDaily will report material changes to notice levels or destination lists.
Frequently Asked Questions
Which countries are on the updated CDC dengue notice? As of the July 30 update, the notice names Colombia, Samoa, Vietnam, New Caledonia, the Maldives, Bolivia, Tonga, Cambodia, Kenya, Malaysia, and Sri Lanka.
Does a CDC travel notice mean I should cancel my trip? No. Level 1 and Level 2 notices recommend precautions. CDC currently lists no destinations at Level 3 or Level 4 for dengue or chikungunya.
What is the difference between dengue and chikungunya symptoms? Both begin with fever. Chikungunya is defined by severe joint pain that can linger for months. Dengue's dangerous phase often begins as fever subsides, with warning signs including severe abdominal pain and bleeding.
Is there a chikungunya vaccine available in the United States? Vimkunya, a virus-like particle vaccine, remains licensed for people 12 and older. Ixchiq's U.S. license was suspended in August 2025 and the manufacturer later withdrew its application.
Should pregnant travelers change plans? CDC advises pregnant travelers to reconsider travel to areas with chikungunya outbreaks, particularly near delivery. Decisions should be made with an obstetric provider.
What should I do if I get a fever after returning? Call a clinician within 14 days of return and state your travel history immediately, so the correct tests are ordered without delay.
How can I protect myself from bites during the day? Use an EPA-registered repellent, wear long sleeves and pants, and choose lodging with air conditioning or intact window and door screens. Aedes mosquitoes bite in daylight.
