In Côte d’Ivoire wurden in den ersten 34 Wochen des Jahres 14 bestätigte Gelbfieberfälle und zwei Todesfälle gemeldet. Die Fälle traten in acht Gesundheitsbezirken auf: Doropo, Téhini, Agboville, Bouna, Danané, Jacqueville, San Pedro und Toulepleu.
Besonders häufig erkrankten ältere Kinder, Jugendliche und Erwachsene zwischen 15 und 39 Jahren. In den Wochen 32–34 wurden wieder mehr Fälle festgestellt.

 

Die Impfquote gegen Gelbfieber ist in einigen Regionen zu niedrig. Mehrere betroffene Gebiete liegen zudem an den Grenzen zu Burkina Faso, Ghana, Liberia und Guinea. Die zusammenhängenden Waldgebiete und die hohe Mobilität der Bevölkerung, unter anderem durch den handwerklichen Goldabbau, könnten eine grenzüberschreitende Ausbreitung begünstigen.

Auch in Ghana wurden bestätigte Gelbfieberfälle gemeldet, sodass eine grenzüberschreitende Ausbreitung möglich ist.

 

 

On 17 September 2026, Costa Rica’s Ministry of Health reported a chikungunya outbreak in the densely populated urban Pavas District, San José Province, with 12 confirmed and three probable cases. No deaths have been reported. The outbreak was linked to travellers returning from Nicaragua, with subsequent local transmission confirmed in five sectors of Pavas.

 

A concurrent chikungunya outbreak in Playa Langosta, Guanacaste Province, remains active; year-to-date 2026, Costa Rica has reported 367 total chikungunya cases nationally.

On 15 September 2026, 46 people were hospitalised after eating banh mi sandwiches from a newly opened bakery in Quang Tri Province. Laboratory testing found widespread bacterial contamination in food and clinical samples, predominantly Salmonella spp. All patients recovered and were discharged by 22 September; no deaths were reported. The bakery was temporarily closed.

As of 15 September 2026, Nepal had reported 121 laboratory-confirmed Japanese encephalitis cases (+ 75 since mid of August 2026) and 26 deaths across all seven provinces. Jhapa district had the highest reported burden, with 13 cases and seven deaths. A vaccination campaign targeting adults over 30 began in Jhapa on 21 September.

On 9 September 2026, Danish authorities reported six people hospitalized with severe botulism after botulinum toxin injections for excessive sweating or cosmetic purposes. The patients have not identified where or from whom they received treatment. An unapproved botulinum toxin product administered at an unregistered clinic or by an unauthorized provider is suspected. Investigations are ongoing.

As of 18 September 2026, eight cases of Plasmodium falciparum malaria have been reported among people working at or living in the vicinity of Frankfurt international airport. Six cases occurred among airport workers. Five of these cases developed symptoms in early July and one in mid-August. Two additional cases were subsequently reported among residents of different households living within 5 km of the airport, who developed symptoms in early September. None reported travel to a malaria-endemic area. Three of the eight affected individuals have died, including one of the two residents living near the airport.

 

The cases are consistent with airport-associated malaria. Multiple introductions of infectious mosquitoes are considered likely, while the possible involvement of local Anopheles mosquitoes cannot be excluded. Investigations are ongoing to clarify the circumstances of transmission and possible links between the cases.

The Swiss Expert Committee for Travel Medicine has updated the list of countries with chikungunya transmission risk based on CDC country list and epidemiological news (red = changes since the previous update of 19 August 2026).

 

On 26 August 2026, eight people - six tourists and two residents - were treated for suspected ciguatera fish poisoning on Fernando de Noronha, Brazil. Seven cases were linked to one restaurant and the eighth to another; all patients recovered.

 

Between 2022 and 2026, 255 suspected ciguatera cases were recorded on the island, with no deaths. Cases occur most frequently in August and September and have mainly been associated with eating barracuda, jacks and groupers.

 

Ciguatera Poisoning: Ciguatera is a non-contagious foodborne illness caused by eating fish containing ciguatoxins, usually due to improper preparation. Symptoms appear 3–6 hours after ingestion (up to 30 hours) and typically start with gastrointestinal issues—diarrhea, nausea, vomiting, and abdominal pain—followed by neurological and neuropsychiatric signs such as paresthesia, weakness, burning or metallic taste, memory issues, fatigue, and mood changes. Cold allodynia and temperature reversal are distinctive but not always present. Neurologic symptoms may last days to months, while cardiovascular effects can include bradycardia, heart block, or hypotension.

As of 7 September 2026, Kerala had reported 171 confirmed cases of amoebic meningoencephalitis (AME), including 44 deaths. The persistently high case numbers follow the elevated case numbers observed in 2025, when 201 cases were reported.