A mosquito trapped in Portland has tested positive for West Nile virus, prompting city officials to launch targeted spraying and issue health precautions for residents.
The mosquito was trapped on the 100 block of Granby Place and sent for testing Tuesday. City officials received the results today.
Following the positive test, Portland entered Risk Level 3. That designation triggers targeted spraying within a half-mile radius of where the mosquito was trapped. Spraying began Friday evening and will continue for several days. The surrounding area will also be treated with mosquito larvicide…