Culex pipiens (the northern house mosquito or common house mosquito) is a species of blood-feeding mosquito of the family Culicidae. It is a vector for diseases, including Japanese encephalitis. In the U.S. and parts of Europe, it can spread West Nile virus, and in Emilia-Romagna, Italy, it has been demonstrated to be a vector of Usutu virus. It occurs in the following countries (this list is not exhaustive): Argentina, Australia, Austria, Belgium, Bosnia and Herzegovina, Bulgaria, Canada, Croatia, Cyprus, Czech Republic, Egypt, France, Germany, Greece, Hungary, Iran, Ireland, Israel, Italy, Japan, Jordan, Korea (South), Latvia, Lebanon, Lithuania, Luxembourg, Morocco, Pakistan, Poland, Portugal, Romania, Russia, Saudi Arabia, Serbia, Slovakia, Spain, Sweden, Tajikistan, Tunisia, Turkey, the United Kingdom, the United States, Uruguay, the Netherlands and Montenegro.