Dengue and West Nile on the increase in Italy, the weekly ISS bulletin

The latest bulletin from the Istituto Superiore di Sanità records an increase in cases of West Nile virus, which rises to 787 infections, and of Dengue, which reached 369. Ten more cases of West Nile and twelve of Dengue compared to last week. The persistence of mild temperatures continues to favor the spread of vectors across the national territory, maintaining high health attention. The ISS bulletin also reports 30 confirmed cases of Chikungunya, one of which is indigenous and the others associated with travel abroad. For 34% of imported cases the place of exposure is represented by the Seychelles.

Local cases and cases associated with travel abroad

According to the bulletin, of the 787 confirmed cases of West Nile, 422 occurred in the neuroinvasive form. These include five imported cases, respectively from the Maldives, France, Belgium, Greece and the Netherlands. We also identified 96 asymptomatic cases among blood donors, 263 cases of fever, five cases with other symptoms and one additional asymptomatic case. Among the febrile cases, two were imported, one from Burkina Faso and one from Greece. There have been 61 deaths reported since the start of surveillance, of which one related to an imported case, the same number recorded in the previous update. As regards Dengue, 369 confirmed cases were recorded from 1 January to 27 October 2026, compared to 357 the previous week. Of these, 73 are indigenous, while the others are associated with travel abroad. 51% of imported cases are linked to exposure to the Maldives. No deaths were reported.