El Paso health officials have confirmed that mosquitoes located in the Upper Valley have tested positive for the West Nile Virus, the City said in a press release on Thursday. The City says the West Nile Virus is the leading cause of the mosquito-borne disease in the U.

West Nile Virus was identified in a mosquito collected in Middleboro, town officials said Wednesday. Symptoms of the virus tend to include fever and flu-like illnesses. The virus has a more significant effect on people over the age of 50, according to health officials.