Vector Control Officers this afternoon conducted a house by house survey of the 400 block of Bartlett Street, following several positive tests in that area for mosquitos carrying the West Nile Virus.  Officers discovered standing water with mosquito larvae at four separate locations and treated the water with a solution to kill them.  Only live adult mosquitoes are tested for the virus, so it is unknown if the larvae were carrying the virus.  Vector Control officers have checked numerous storm drain inlets, storm sewers and other potential sources of standing water during the past several weeks, but thus far have been unable to locate the source of the mosquitoes.  Tonight Vector Control will spray the area for a third night in a row, in a quest to eradicate the mosquitoes carrying the virus. Citizens living in this neighborhood are strongly urged to properly dispose of old car tires, and empty all containers that may hold standing water.