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

Since the start of 2026, and as of 5 August 2026 (data collection period 3–5 August, data available up to 28 July), 219 522 chikungunya virus disease (CHIKVD) cases and 81 associated deaths have been detected in 25 countries, excluding EU/EEA countries and territories. Cases reported in July (6 746 cases) decreased compared with June, when 41 959 cases were reported. Deaths reported in July (four deaths) also decreased compared with the previous month, when 23 deaths were reported.

The Philippines have reported CHIKVD cases for the first time in 2026.

In 2026, 12 countries have ongoing CHIKVD outbreaks. Of these, the majority are in the Americas. Below is a description of ongoing outbreaks:

Americas

In 2026, there have been 173 655 CHIKVD cases and nine associated deaths reported in the region. The most affected subcontinental region is South America, with Brazil reporting the highest number of cases in 2026.

• Argentina: CHIKVD cases are reported through the year in the country. Since the start of the year and as of epidemiological week 28 (12–18 July), CHIKVD cases have been reported from ten jurisdictions (Buenos Aires, Autonomous City of Buenos Aires, Cordoba, Entre Rios, Chaco, Catamarca, Jujuy, Salta, Santiago del Estero, Tucuman). Most cases have been reported by Salta and Tucuman. Reported cases have been decreasing since epidemiological week 16.

• Bolivia: CHIKVD cases have been extensively reported in the country since the start of 2026. The most affected departments are Santa Cruz, Cochabamba, Tarija and La Paz. Santa Cruz reported most of CHIKVD cases in Bolivia. At the national level, the number of reported cases has continued to decrease in the past few weeks.

• 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 (25-28), where Bahia, Alagoas, Pernambuco, 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 (58%), being the 20 to 29 years age group the most affected one.

• Colombia: CHIKVD cases have been sporadically reported during the year. Confirmed CHIKVD cases have been reported from Antioquia, Huila, and Santander departments.

• Costa Rica: In 2026, 82 CHIKVD cases have been reported from Puntarenas city, Esparza region. The current outbreak is located in the North-West of the country, affecting San Jose, Puntarenas, Guanacaste, Alajuela, and Heredia provinces. In 2025, a total of eight CHIKVD cases were reported.

• El Salvador: In 2026, twelve suspected CHIKVD cases have been reported in the country. In 2025, 11 CHIKVD cases were reported in the same period.

• Guatemala: In 2026, one confirmed CHIKVD case has been reported in the country. The case was reported from San Marcos department, bordering with the Mexican Chiapas State, where CHIKVD cases have also been reported in 2026. In 2025, no confirmed CHIKVD cases were reported in Guatemala.

• Paraguay: In 2026, there have been 19 confirmed cases in the country. In the same time period in 2025, 48 confirmed cases were reported.

• Venezuela: In 2026, four confirmed CHIKVD cases have been reported in the country. Confirmed cases have been reported by Distrito Federal and Sucre federal jurisdictions.

Asia

In 2026, 45 435 CHIKVD cases and no associated deaths have been reported in the region. The most affected subcontinental region is Southeast Asia, with India being the country reporting the highest number of cases in 2026.

• China: In 2026, 88 CHIKVD cases have been reported in the country. In 2025, approximately 400 cases were reported in the same period.

• Pakistan: A total of 28 CHIKVD cases have been reported in the country in 2026. All cases have been reported from Sindh and Khyber Pakhtunkhwa regions. CHIKVD cases are reported throughout the year in Pakistan, concentrated in Baluchistan, Khyber Pakhtunkhwa, and Sindh provinces. These provinces are located in the Southwest of the country.

• Philippines: In 2026, CHIKVD cases have been reported by Gandara Municipal Health Officer. A total of two outbreaks have been identified, with a total of 84 cases reported.

Africa

In 2026, approximately 432 CHIKVD cases and no associated deaths have been reported in the region. The most affected subcontinental region is East Africa, with Mauritius being the country reporting the highest number of cases in 2026.

Europe

Since the beginning of 2026 and as of 5 August 2026, France was the only European country to report locally acquired chikungunya virus disease transmission, with seven locally acquired CHIKVD cases identified.

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.