Colombia has recorded 58 laboratory-confirmed yellow fever cases and 27 deaths so far in 2026, a case fatality rate of 46.5%, according to preliminary Instituto Nacional de Salud data through Sept. 8, compiled by Outbreak News Today. On Sept. 18, CDC posted a Level 2 travel notice for Colombia, which asks travelers to practice enhanced precautions, citing increasing numbers of yellow fever cases.
The notice matters most for people who already have tickets. CDC says travelers to newly affected areas are now recommended to get vaccinated. It adds that a booster may be given to travelers whose last dose was at least 10 years ago and who will be in higher-risk settings, such as areas of Colombia where cases have been reported. That point runs against a common belief that one dose settles the question for every traveler.
For households planning a fall or holiday trip, timing is the real question. "Get vaccinated at least 10 days before travel," the CDC notice advises, and it warns that not all providers carry yellow fever vaccine, which can make that window tighter than it looks.
Tolima Remains the Center of Colombia's Outbreak
About 95% of this year's confirmed cases originated in the department of Tolima. Confirmed Tolima cases were led by Chaparral with 21, followed by Icononzo with 8, Cunday with 7, and Ortega and Melgar with 5 each. Smaller numbers came from Carmen de Apicalá, Rioblanco, Purificación, Suárez, Dolores, and Planadas. Outside Tolima, one confirmed case originated in Villavicencio in Meta, and two came from Paratebueno in Cundinamarca.
Health officials also counted 1,183 probable cases this year, with symptom onset dates from Jan. 4 to Aug. 8. Those probable cases are not confirmed and should not be read as a final count.
The virus is still active in nature. Officials confirmed 32 yellow fever cases in monkeys during 2026, most recently on Sept. 4 in a rural area of Icononzo. Infections in monkeys can signal that infected mosquitoes are circulating nearby.
From 2024 through 2026, Colombia has confirmed 206 cases and 86 deaths in 11 departments, a cumulative fatality rate of 41.7%. Three additional confirmed cases originated in Venezuela.
Changes Since MedicalDaily's June Report
MedicalDaily previously reported in June on the outbreak's unusually high death rate, citing 76 deaths since 2024. The newer cumulative total of 86 deaths comes from Colombia's national institute and a later reporting period, so the two figures are not a precise side-by-side comparison. Both point in the same direction: deaths have continued to accumulate through the summer.
Colombia was also under a Level 2 notice at the time of the June report. The September notice speaks directly to travelers about vaccine timing, provider availability, and boosters. It also notes that cases in Tolima include new areas bordering places where vaccination has historically been recommended.
Planning Around the 10-Day Vaccine Rule
Yellow fever vaccine is given only at registered clinics, and supply varies by location. Travelers should call ahead, confirm the clinic has doses, and book early enough to clear the 10-day mark. The clinic issues an International Certificate of Vaccination or Prophylaxis, often called the yellow card, which some countries require from travelers arriving from areas with yellow fever risk.
Not every itinerary carries the same risk. CDC's Colombia destination page maps which parts of the country carry a vaccine recommendation. Travelers should compare their exact route, including weekend side trips outside big cities, against the current map.
The vaccine is not right for everyone. According to CDC's yellow fever vaccine guidance, some people should not receive it, and others need an individual review of risks and benefits. Infants, adults 60 and older, pregnant or breastfeeding people, and people with weakened immune systems should talk with a clinician first. Travel vaccines are often not covered by insurance, so asking for the price in advance can prevent a surprise bill.
Mosquito protection still matters for vaccinated and unvaccinated travelers alike. Repellent, long sleeves, and screened lodging reduce bites from the mosquitoes that spread the virus.
Warning Signs and the Next Official Update
Symptoms usually appear three to six days after infection and include fever, chills, headache, backache, and muscle aches. About 15% of infected people develop severe illness that can lead to liver disease, bleeding, shock, organ failure, and sometimes death, according to CDC. There is no medicine to treat or cure the infection. Anyone who develops fever during or after a trip should seek care promptly and tell the clinician where they traveled.
Colombia's institute updates its figures regularly, and CDC can revise the notice or its risk map as new areas report cases. MedicalDaily will track whether the 2026 count keeps rising and whether CDC expands the recommended areas. For most families, the central step remains the same: get vaccinated at least 10 days before a trip to an affected area.
Key Questions Answered
What did CDC announce about yellow fever in Colombia?
CDC posted a Level 2 travel notice for Colombia on Sept. 18, 2026. It stresses vaccination at least 10 days before travel to affected areas and notes that some travelers vaccinated 10 or more years ago may receive a booster.
How many yellow fever cases has Colombia reported in 2026?
Preliminary data through Sept. 8 show 58 confirmed cases and 27 deaths, along with 1,183 probable cases. About 95% of confirmed cases originated in Tolima.
Do I need a yellow fever vaccine for Colombia?
It depends on your itinerary. Check CDC's Colombia page for the current risk map and talk with a travel health provider about your specific route.
Is one yellow fever shot enough for life?
For many travelers, yes. CDC says a booster may be given to people whose last dose was at least 10 years ago and who will be in higher-risk settings, such as areas of Colombia reporting cases.
Who should talk with a doctor before getting the yellow fever vaccine?
Infants, adults 60 and older, pregnant or breastfeeding people, and people with weakened immune systems should discuss risks and benefits with a clinician first.
What symptoms should travelers watch for?
Fever, chills, headache, backache, and muscle aches can appear three to six days after infection. Seek care promptly and share your travel history.
