BOSTON -- Another Boston neighborhood is on alert after a pool of mosquitoes in Jamaica Plain tested positive for West Nile virus last week, according to the Boston Public Health Commission.

Infected mosquitoes have also been found in North Dorchester, West Roxbury and Hyde Park. Multiple positive mosquito pools suggest that West Nile virus is likely present throughout the city, health officials said.

So far, there has been one human case of West Nile virus in Boston this year. A 46-year-old woman was diagnosed on Aug. 27. She has since recovered.

Since June, larvicide has been placed into city catch basins designed to reduce the number of mosquitoes in the city. Spraying has been done for mosquito nuisance control in parts of some neighborhoods, but there are currently no plans to expand spraying throughout the city, health officials said.

West Nile virus is most commonly transmitted to humans by the bite of a mosquito infected with the virus, said Dr. Anita Barry, director of the Infectious Disease Bureau at the Public Health Commission.

Barry said it is very important for people to take precautions to reduce the risk of being bitten by an infected mosquito, including wearing insect repellant, wearing long sleeves and pants during peak mosquito hours between dusk and dawn and removing pools of standing water.