The New York Health Department will spray pesticide from trucks in parts of the city Wednesday to reduce mosquito activity and the risk of West Nile Virus. For these sprayings, the Health Department said they will use a very low concentration of Anvil 10 + 10, a synthetic pesticide. When properly used, this product poses no significant risks to human health. The Health Department recommends that people stay indoors during spraying. People with asthma or other respiratory conditions are encouraged to stay inside during spraying since direct exposure could worsen these conditions. Officials say air conditioners may remain on. However, if people wish to reduce the possibility of indoor exposure to pesticides, set the air conditioner vent to the closed position, or choose the re-circulate function. The health authorities also advise residents to remove children \'s toys, outdoor equipment and clothes from outdoor areas during spraying. If outdoor equipment and toys are exposed to pesticides, wash them with soap and water before using again. For the first time this season, the New York City Health Department has detected West Nile Virus in mosquitoes in the city. No human cases have yet been detected. The Health Department has increased mosquito surveillance by setting up additional traps and treating catch basins in the affected areas. \"Now that West Nile virus has returned to New York City, it is important to take simple precautions to protect you and your family,\" said Health Commissioner Thomas Farley. \"Be sure to wear mosquito repellent when outdoors, and cover your arms and legs if you\'re outside at dawn or dusk. New Yorkers over 50 should be especially cautious, as they are more likely to develop serious illness if they contract the virus,\" he added. Not everyone infected with West Nile Virus will become ill. However, West Nile Virus can cause serious complications, including neurological diseases, and can also cause a milder flu- like illness with headache, fever and fatigue, weakness and sometimes rash.