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.

Since the beginning of the 2026 transmission season, and as at 3 September, 144 areas affected by West Nile virus (WNV) have been identified in 15 countries across Europe, with 1’086 locally acquired human cases. Key findings:

• The 2026 WNV season is currently seeing an intense level of circulation in both humans and animals in several European countries.
  
• There is currently no indication of increased disease severity in humans in Europe.
  
• Italy remains the most affected country in 2026, reporting the most human cases and avian outbreaks. Greece has reported a record number of human WNV cases for this time of the year.
  
• The Netherlands reported its first human WNV infections since 2020, alongside outbreaks in birds and equids, across a broad geographic area.
  
• Although no human WNV cases have ever been notified in Belgium, ongoing circulation in birds and equids across eight regions suggests a risk for human infections.
  
• North Macedonia is experiencing an unprecedented WNV outbreak in the capital region, with human cases and detections in birds.
  
• Further human cases and animal outbreaks may be expected in the coming weeks in Europe.
• For details by country, see LINK.

 

Am 18. August 2026 trat der Notfallausschuss für die Ebola-Bundibugyo-Virus-Krankheit (BVD) Epidemie in der Demokratischen Republik Kongo zum zweiten Mal zusammen, um die Lage gemäss den Internationalen Gesundheitsvorschriften (2005) neu zu bewerten. Das Risiko wurde wie folgt eingestuft:

Sehr hoch für Länder mit einer Übertragung der BVD innerhalb der Bevölkerung: D.R. Kongo
Hoch für Länder, deren Landgrenzen an Länder mit einer Übertragung der BVD innerhalb der Bevölkerung angrenzen: Angola, Burundi, die Zentralafrikanische Republik, die Republik Kongo, Ruanda, der Südsudan, Tansania, Uganda und Sambia.
Gering für den Rest der afrikanischen Region sowie alle anderen Länder ausserhalb Afrikas.

Für Reisende aus Europa stufte das ECDC das Risiko als sehr gering ein, sofern die Vorsichtsmassnahmen (siehe unten unter „Auswirkungen für Reisende“) befolgt werden. Aktuelle epidemiologische Informationen finden Sie im WHO-Dashboard und beim ECDC.

   

In 2025, Chile reported 11’155 syphilis cases (55.2 per 100’000 population), the highest notification rate recorded between 2016 and 2025 and 2.4 times the 2016 rate. Between 2021 and 2025, men accounted for approximately 65% of cases, and adults aged 20–39 years for 58%. A marked increase was observed among men aged ≥60 years: reported cases more than doubled from 419 in 2021 to 909 in 2025 (50.8 per 100’000).

The number of malaria cases among airport workers at the Frankfurt Airport has increased to six cases: Five cases developed symptoms in early July and one in mid-August 2026. Two died - one in July, with malaria diagnosed post-mortem, and one in August - while the remaining four have recovered. All cases involved airport personnel working in administration, technical operations, or cargo/aircraft handling with no travel history to malaria-endemic area.

 

Investigations are ongoing. The presumed source of infection is one or more Anopheles mosquitoes imported aboard an aircraft arriving from a malaria-endemic region.

D.R. Kongo: Der Ausbruch der durch das Bundibugyo-Virus verursachten Krankheit in der Demokratischen Republik Kongo ist von einer intensiven und anhaltenden Übertragung geprägt, was ihn zum bislang grössten und sich am schnellsten ausbreitenden Ebola-Ausbruch des Landes macht. Ursprünglich war er auf die Gesundheitszone Mongbwalu in der Provinz Ituri beschränkt, hat sich jedoch mittlerweile auf 54 Gesundheitszonen in sechs Provinzen ausgebreitet. Im Zeitraum vom 3. bis 9. August 2026 wurden rekordverdächtige 579 Fälle und 304 Todesfälle gemeldet. Unsicherheit, Vertreibung der Bevölkerung und grenzüberschreitende Bewegungen behindern die Bekämpfungsmassnahmen und erhöhen das Risiko einer weiteren Ausbreitung. Die nationalen Behörden, die WHO und ihre Partner verstärken ihre Massnahmen erheblich, um diesen Gesundheitsnotstand von internationaler Tragweite einzudämmen.

Uganda: Am 28. Juli 2026, 12 Tage nach Entlassung des letzten Patienten, erklärte das ugandische Gesundheitsministerium den Ebola-Ausbruch für beendet. Insgesamt waren 20 bestätigte Fälle, darunter zwei Todesfälle, gemeldet worden.

Stand: 18. August 2026; aktuelle Informationen finden Sie unter Dashboard und ECDC.

   

As of 17 August 2026, the CDC had recorded 15’716 domestically acquired, laboratory-confirmed cyclosporiasis cases across 47 states, including 828 hospitalizations and two deaths. Of these, 9’481 cases in 17 states were epidemiologically linked to Taylor Farms de Mexico iceberg lettuce recalled on 17 July.

 

Michigan remains the epicenter, reporting 13’909 cases, 314 hospitalizations and two deaths as of 13 August. Its higher figure includes all reported state cases, including infections not yet assigned to the lettuce-associated cluster and cases delayed by a laboratory backlog. Illness onsets have continued into August, although Michigan reports a declining trend in new infections.