On Wednesday, infected mosquitoes were detected in 94025 ZIP code, said the San Mateo County Mosquito and Vector Control District. Authorities concerned have announced that a swathe of Menlo Park will be fogged to remove any mosquitoes carrying West Nile Virus. The activity will be carried out Sunday and Monday.

If the weather remains good then the fogging operation will take place between 9pm Sunday and 5am on Monday. The activity will majorly be carried out in a residential area bounded by Menlo Avenue to the north, San Mateo Drive to the west, Creek Drive to the south and Waverley Street to the east.

Mosquitoes that will be collected from the operation will be checked for the virus presence. Authorities concerned stated that there is a possibility that the area may be treated again. During the operation, a chemical is used known as Zenivex E4.

This chemical is said to pose very little risk to humans and environment. It is applied in very low doses and is generally sprayed early in morning. It is the time when bees, butterflies and other important insects are not active.

The virus can be transmitted to humans through a mosquito bite. Therefore, residents have been requested to take precautions. They should apply insect repellent containing DEET, picaridin, oil of lemon eucalyptus. People should keep windows and doors closed and remove standing water around the exteriors of their homes.