Rapid increase in neuroinvasive West Nile virus infections in humans, Italy, July 2022

Euro Surveill. 2022 Sep;27(36):2200653. doi: 10.2807/1560-7917.ES.2022.27.36.2200653.


As in 2018, when a large West Nile virus (WNV) epidemic occurred, the 2022 vector season in Italy was marked by an early onset of WNV circulation in mosquitoes and birds. Human infections were limited until early July, when we observed a rapid increase in the number of cases. We describe the epidemiology of human infections and animal and vector surveillance for WNV and compare the more consolidated data of June and July 2022 with the same period in 2018.

Keywords: Italy; One Health; West Nile virus; epidemiology; outbreaks; public health policy; surveillance; vector-borne infections; viral infections.

MeSH terms

  • Animals
  • Birds
  • Culicidae*
  • Humans
  • Italy / epidemiology
  • Mosquito Vectors
  • West Nile Fever* / epidemiology
  • West Nile Fever* / veterinary
  • West Nile virus*