epa03367655 A handout image made available on 22 August 2012 from the Centers for Disease Control showing a Culex quinquefaciatus female mosquito feeding on human blood. This species is a known vector for West Nile Virus. The female C. quinquefasciatus mosquito is known as one of the many arthropodal vectors responsible for spreading the West Nile virus to human beings through their bite when obtaining a blood meal. Mosquitoes of the Culex species lay their eggs in the form of egg rafts that float in still or stagnant water. The mosquito lays the eggs one at a time sticking them together in the shape of a raft. An egg raft can contain from 100 to 400 eggs. The eggs go through larval and pupal stages and feed on micro-organisms before developing into flying mosquitoes. The CDC is reporting that there have currently been 1,100 cases of West Nile Virus reported in the US in 2012, more than ever reported at this point in the year since the virus was first recorded in the US in 1999. EPA/JIM GATHANY / CENTERS FOR DISEASE CONTROL / HANDOUT HANDOUT EDITORIAL USE ONLY/NO SALES

Salgono a 647 i casi confermati di infezione da West Nile Virus (WNV) in Italia dall’inizio dell’anno (contro i 582 del precedente bollettino), con 47 decessi. Lo riporta il decimo bollettino di sorveglianza dell’Istituto superiore di sanità (Iss).

Tra i casi notificati, 300 hanno avuto forma neuro-invasiva: 15 in Piemonte, 39 in Lombardia, 24 in Veneto, 2 in Friuli Venezia Giulia, 1 in Liguria, 23 in Emilia-Romagna, 5 in Toscana, 83 nel Lazio, 2 in Molise, 77 in Campania, 2 in Puglia, 2 in Basilicata, 5 in Calabria, 1 in Sicilia e 19 in Sardegna.

Registrati inoltre 54 casi asintomatici in donatori di sangue, 284 casi febbrili (di cui 1 importato dal Kenya), 3 asintomatici e 6 sintomatici. La letalità delle forme neuro-invasive confermate è pari al 15,8% (20% nel 2018, 14% nel 2024).

Nello stesso periodo sono stati segnalati 9 casi di Usutu virus (2 Piemonte, 2 Lombardia, 2 Veneto, 3 Lazio). La circolazione del WNV è stata dimostrata in 72 province di 17 regioni, comprese Sicilia e Sardegna.

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