Chikungunya virus disease – Multi-country (World) – Monitoring global outbreaks – Monthly update

Since the previous update (data collection period 22–24 September, data available up to 30 August) and as of 30 September (data collection period 29–30 October, data available up to 30 September), 20 986 chikungunya virus disease (CHIKVD) cases and 26 associated deaths have been detected in 14 countries, excluding EU/EEA countries and territories. Cases reported in September (20 456 cases) decreased compared with August, when 29 798 cases were reported. However, deaths reported in September (26 deaths) increased compared with the previous month, when two deaths were reported. In 2026, a total of 271 223 CHIKVD cases and 113 associated deaths have been reported.

No new countries have reported CHIKVD cases in September for the first time in 2026.

In 2026, 15 countries reported ongoing CHIKVD outbreaks. Of these, the majority are in the Americas. Below is a description of ongoing outbreaks:

Americas

In 2026, there have been 216 594 CHIKVD cases and 113 associated deaths reported in the region. The most affected subcontinental region is South America, with Brazil reporting the highest number of cases in 2026 (135 878 cases).

• Argentina: CHIKVD cases are reported through the year in the country. Since epidemiological week 31 (2-8 August), the country has started seasonal surveillance for the period 2026/2027. As of epidemiological week 38 (20-26 September), one confirmed case has been reported from Salta. In the previous season, CHIKVD cases were reported from ten jurisdictions (Buenos Aires, Autonomous City of Buenos Aires, Cordoba, Entre Rios, Chaco, Catamarca, Jujuy, Salta, Santiago del Estero, Tucuman), being Salta and Tucuman the most affected provinces.
• Bolivia: CHIKVD cases have been extensively reported in the country since the start of 2026, being the most affected departments Santa Cruz, Cochabamba, Tarija and La Paz. Santa Cruz reported most of CHIKVD cases in Bolivia. At national level, the number of reported cases has decreased in September compared to August.
• Brazil: CHIKVD cases continue to be reported in all regions (Centro-Oeste, Nordeste, Norte, Sudeste, and Sul) and in most federal units of the country. The Centro-Oeste, Sudeste, and Nordeste regions continue to account for the highest number of cases in the last four epidemiological weeks (35-38), where Bahia, Mato Grosso Do Sul, and Minas Gerais are the most affected federal units. Since the start of 2026, CHIKVD cases have continuously increased in Brazil until epidemiological week 14. This year, most of the cases have been reported among females (59%), being the 20 to 29 years age group the most affected one. In 2026, a total of 135 878 CHIVKD cases has been reported from Brazil by the end of epidemiological week 38.
• Costa Rica: In 2026, 719 CHIKVD cases have been reported with a significant increase in case reporting during September. Cases have been reported from six out of seven provinces, only Cartago province didn’t report cases.
• El Salvador: In 2026, 16 CHIKVD case have been reported in the country. In 2025, 16 CHIKVD cases were reported in the same period.
• Guatemala: In 2026, 18 CHIKVD case have been reported in the country. In 2025, 24 CHIKVD cases were reported in the same period.
• Honduras: In 2026, 18 CHIKVD cases have been reported in the country. In 2025, 23 CHIKVD cases were reported in the same period. The first reported case in 2026 was from San Marcos Department, close to the border with Mexico.
• Panama: In 2026, six CHIKVD cases have been reported in the country. In 2025, 19 CHIKVD cases were reported in the same period.
• Suriname: CHIKVD cases continue to be reported in the country, reaching a total of 16 660 cases in 2026.
• United States: On September 2026, the Florida Department of Health reported a locally acquired case of
• CHIKVD in the county.
• Venezuela: In 2026, 39 CHIKVD cases have been reported in the country. No CHIKVD cases were reported in 2025.

Asia

In 2026, 47 670 CHIKVD cases and no associated deaths have been reported in the region. The most affected subcontinental region is South Asia, with India reporting the highest number of cases in 2026 (45 402 cases).

• China: In 2026, 1 649 CHIKVD cases have been reported in the country. In 2025, 16 452 CHIKVD cases were reported for the same period, linked to the outbreaks from Guangdong and Guanxi provinces.
• India: In 2026, 45 402 CHIKVD cases have been reported in the country. In India, most of the cases are reported from Gujarat, Karnataka, and Maharashtra states.
• Pakistan: A total of 535 CHIKVD cases has been reported in the country in 2026. Cases have significantly increased in September (476 new cases), with Sindh and Khyber Pakhtunkhwa regions showing the highest case counts. Recently, cases have also been reported from Baluchistan province. In general, CHIKVD cases are reported throughout the year in Pakistan, mainly concentrated in Baluchistan, Khyber Pakhtunkhwa, and Sindh provinces. These provinces are located in the southwest of the country.

Africa

In 2026, at least 6 959 CHIKVD cases and no associated deaths have been reported in the region. The most affected subcontinental region is East Africa, with Mauritius reporting the highest number of cases in 2026 (6 929 cases).

• Mauritius: Since January 2026, the country has reported a total of 6 929 CHIKVD cases from Mauritius Island and Rodriges Island. Most of the cases are reported from Mauritius Island.

Europe

Since the beginning of 2026 and as of September 2026, two countries in Europe have reported locally acquired cases of chikungunya virus disease: France and Italy. For more information on CHIKVD cases reported in mainland EU/EEA, please visit the dedicated ECDC website. CHIKVD cases have been reported from the French outermost regions of French Guiana, Mayotte and Réunion.

The data presented in this report originate from both official public health authorities and non-official sources, such as news media, and depending on the source, autochthonous and non-autochthonous cases may be included. Data completeness depends on the availability of reports from surveillance systems and their accuracy, which varies between countries. All data should be interpreted with caution and comparisons, particularly across countries, should be avoided due to under-reporting, variations in surveillance system structure, different case definitions from country to country and over time, and use of syndromic definitions.

ECDC monitors this threat through its epidemic intelligence activities and reports on it on a monthly basis. A summary of the worldwide overview of CHIKVD is available on ECDC's website.