
ISS bulletin reports indigenous dengue outbreaks in Tuscany, Puglia and Lombardy, 54 deaths from West Nile
AI-generated summary
The Higher Institute of Health monitors arbovirosis in Italy through a national surveillance system, reporting cases of Dengue, Chikungunya, Zika, Usutu and West Nile viruses, distinguishing between native infections and those associated with travel abroad.
From 1 January to 22 September 2026, the national surveillance system of the Higher Institute of Health (ISS) "showed 312 confirmed cases of Dengue: 47 of these are indigenous while all the other cases are associated with travel abroad, no deaths". According to the update of the ISS arbovirus bulletin, since the beginning of the year "28 confirmed cases of Chikungunya have also been recorded: 1 of these cases was identified as indigenous while all the others are associated with travel abroad, no deaths, and 3 cases of Zika virus, all associated with travel abroad, no deaths". Finally 15 cases of Usutu virus.
Dengue outbreaks
"In particular, with regard to the Dengue virus, 3 episodes of local transmission have been identified and 4 cases currently considered sporadic: an outbreak made up of 26 confirmed cases of infection with exposure in a municipality in the province of Livorno (Tuscany). Further epidemiological investigations and activities to combat the vector are currently underway - we read in the bulletin; another outbreak is made up of 13 confirmed cases of infection, all symptomatic, with exposure in some municipalities in the province of Lecce (Puglia). They are further epidemiological investigations and activities to combat the vector are underway; another outbreak consists of two cases with exposure in a municipality in the province of Milan (Lombardy). Further epidemiological investigations and activities to combat the vector are underway".
See also
Case of native dengue in Trieste, disinfestation begins
Cases of West Nile virus
There have been 700 confirmed cases of West Nile Virus (WNV) since the beginning of the year (there were 657 in the previous report). According to the ISS, 368 manifested themselves in the neuroinvasive form. Among the confirmed cases, 54 deaths have been reported (including one in an imported case). The lethality, calculated on the native neuro-invasive forms reported and confirmed so far, is equal to 14.6% (in the same period of 2025, 14.9%). Last year in the same period there were 680 cases reported with 48 deaths.
See also
West Nile virus, cases are growing in Italy: 700 infections and 54 deaths

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