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Costa Rica: Dengue accelerating transmission
As of 27 July 2026 (epidemiological week 28), Costa Rica reported 2’194 cumulative dengue cases, including 38 cases with warning signs and four hospitalizations. Cases are 17% higher than during the same period in 2025.
The Central Pacific region has the highest incidence rate, while Alajuela Province has the largest number of cases. Orotina canton is the most affected area by incidence, with 1’042 cases per 100’000 inhabitants. Cases are evenly distributed between males and females.
Health authorities have identified major outbreak hotspots in Orotina and La Guácima, where vector control measures, including breeding-site removal and fumigation, are underway.
Note: Costa Rica is also at an outbreak level for chikungunya (See healthytravel website and CDC).
Sri Lanka: Dengue
As of 30 July 2026, Sri Lanka reported 84’724 dengue cases and 62 deaths in 2026, with a case fatality rate of 0.07%. July recorded the highest monthly case count (29’350 cases), accounting for more than one-third of the annual total, following a surge from 21’553 cases in June.
In epidemiological week 29, reported cases declined slightly to 7’385 from 7’619 the previous week. The number of high-risk health areas increased to 175, while average daily dengue hospitalizations remained high at 2’391 patients across sentinel hospitals.
Gampaha and Colombo districts reported the highest case numbers, with Gampaha, Colombo, and Kalutara together accounting for nearly half of all national cases.
India (Kerala): Leptospirosis
As of 31 July 2026, Kerala had reported 1’394 confirmed leptospirosis cases and 63 confirmed deaths, alongside 932 suspected cases and 53 suspected deaths, for a combined total of 2’326 cases and 116 deaths. July alone recorded 415 confirmed cases and 30 deaths, with multiple deaths reported daily in the final week.
Cases were reported across at least 10 districts, indicating widespread state-wide transmission. Death audit data show the highest mortality among manual laborers, followed by agricultural workers and homemakers, with most deaths occurring in people aged 40–69 years.
Health officials also report leptospirosis now accounts for over half of communicable disease deaths in Kerala, with the case fatality rate increasing to 6% in recent years. In response, the Kerala Centre for Disease Control (K-CDC) has updated guidelines to recommend extended doxycycline prophylaxis for workers throughout their occupational exposure period.
France: Chikungunya and Dengue - autochthonous cases
As of 27 July 2026, Metropolitan France reported its first locally acquired chikungunya case of the year in Tarn, Occitanie, indicating local virus circulation. Two unrelated autochthonous dengue cases were also identified in Tarn and Hérault.
Since enhanced surveillance began on 1 May 2026, France has recorded 87 imported chikungunya cases, 261 imported dengue cases, and nine imported Zika cases.
Health authorities are conducting investigations and implementing vector control and prevention measures for all local transmission events.
Cambodia: Dengue
Weltweit: Chikungunya-Risiko – Länder mit Ausbrüchen oder erhöhtem Risiko – Update 16. Juli 2026
Das Schweizer Expertenkomitee für Reisemedizin (EKRM) hat die Liste der Länder mit Chikungunya-Übertragungsrisiko auf der Grundlage der CDC-Länderliste und aktueller epidemiologischer Meldungen aktualisiert (rot = Änderungen seit der letzten Aktualisierung vom 23. April 2026).
D.R. Kongo, Uganda: Bundibugyo-Ebola – Update 16.7.2026
Der Ebola-Ausbruch in der Demokratischen Republik Kongo breitet sich weiter aus. Ein Ende der Epidemie ist derzeit nicht in Sicht. Innerhalb eines Monats hat sich die Zahl der gemeldeten Erkrankungen mehr als verdoppelt – von 695 Fällen am 13. Juni 2026 auf 2’073 Fälle am 14. Juli 2026. Bis zu diesem Zeitpunkt wurden zudem 796 Todesfälle gemeldet. Dies deutet darauf hin, dass sich das Virus weiterhin in der Bevölkerung ausbreitet.
Seit dem letzten Update (9. Juli 2026):
- Am 13. Juli 2026 wurde ein US-Helfer nach einer Ebola-Infektion aus der Demokratischen Republik Kongo zur Behandlung nach Deutschland ausgeflogen. Es ist der zweite US-Bürger, der dort behandelt wird, und der dritte Ebola-Fall, der ausserhalb Afrikas versorgt wird
- In Uganda wurden seit dem 21. Juni 2026 keine neuen Fälle gemeldet.
- Am 16. Juli wurde in Uganda der letzte Ebola-Patient entlassen. Damit begann die 42-tägige Frist bis zur offiziellen Erklärung des Ausbruchsendes.
USA: Significant increase in domestically acquired cyclosporiasis cases – update 13 July 2026
As of 13 July 2026, the US Centers for Disease Control and Prevention (CDC) had received reports of 1’645 laboratory-confirmed domestically acquired cyclosporiasis cases from 34 states, with 141 hospitalizations and no deaths. In addition, more than 5’100 reported cases are still under review to determine whether they meet the definition of domestically acquired cyclosporiasis. Multiple states have reported substantially more cases than during the same period in 2025, and the CDC expects the case count to continue to rise because of a six-week reporting lag. Several multistate outbreak investigations are ongoing to identify the food sources.
Cyclosporiasis outbreaks have been reported repeatedly in the USA and have previously been linked to contaminated fresh produce, particularly leafy vegetables and fresh herbs.
Indien: Verdacht auf Chandipura-Virus-Ausbruch
Im Bundesstaat Gujarat wurden 32 Verdachtsfälle einer Infektion mit dem Chandipura-Virus (CHPV) gemeldet, davon wurden sieben im Labor bestätigt. Alle bestätigten Fälle betreffen Kinder unter 10 Jahren. Drei Kinder sind verstorben, vier werden weiterhin künstlich beatmet; bei neun Verdachtsfällen stehen die Laborergebnisse noch aus. Auch aus dem Bundesstaat Rajasthan wurden Verdachtsfälle gemeldet.
Die Gesundheitsbehörden haben die Überwachung, die Bekämpfung der übertragenden Insekten und die Information der Bevölkerung verstärkt. Eltern werden dringend aufgefordert, bei Kindern mit plötzlich auftretendem Fieber, Erbrechen, Durchfall oder Krampfanfällen sofort ärztliche Hilfe in Anspruch zu nehmen, da sich die Erkrankung innerhalb kurzer Zeit lebensbedrohlich verschlimmern kann. Bereits 2024 wurden in Indien mehr als 240 Fälle und mindestens 82 Todesfälle registriert (siehe EpiNews 5. September 2024).
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