In the summer of 2013, an outbreak of West Nile virus (WNV) infection occurred in the Lombardy, a region of northern Italy to the west of districts affected by WNV in previous years. Eighteen cases of human WNV infection were diagnosed—10 cases of acute WNV neuroinvasive disease and eight of WNV fever. In the same period, WNV was detected in birds (one crow) in horses (11 cases) and from mosquitoes (six pools).
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