Dengue and chikungunya cases 2026

In late July 2026 Delhi’s municipal health authority reported 212 dengue, 62 malaria and 14 chikungunya infections for the year, with six new dengue, four malaria and one chikungunya case recorded in the most recent week. The city’s case numbers were lower than the same period in 2025.

Spain’s Canary Islands health service recorded seven imported dengue cases and three imported chikungunya cases in the first week of August, matching earlier reports of imported infections. Nationwide, Spain confirmed 124 imported dengue and 108 imported chikungunya cases linked mainly to travel to the Maldives, Bolivia and Cuba. Authorities continue to warn that the invasive tiger mosquito, Aedes albopictus, now widespread along the Mediterranean coast, could enable local transmission of dengue, chikungunya, Zika or yellow fever as temperatures rise.

A later Spanish health alert covering epidemiological week 31 showed a surge to 137 imported dengue and 113 chikungunya infections, with a sharp increase in chikungunya notifications from the previous year. The report also noted three imported Zika cases.

In the United States, Florida’s Department of Health confirmed three locally transmitted dengue infections—the first such cases on the continental U.S. this year—signalling active Aedes aegypti transmission. The CDC recorded 1,443 dengue cases nationwide through 28 July, the majority imported, with Cuba identified as the leading source.

Together, the updates illustrate expanding monitoring of dengue and chikungunya across Asia, Europe and North America, highlighting imported case trends, emerging local transmission, and the heightened risk posed by climate‑driven mosquito spread.