Mosquitoes from Bergen, Morris and Passaic counties have tested positive for West Nile virus, according to health officials. No human cases have been reported this year.

County mosquito control have been working throughout the area to spray problem areas. as well as using mosquitofish to eat larvae and is also spraying for adult mosquitoes.

West Nile virus is an arthropod-borne virus most commonly spread by infected mosquitoes. According to the Centers for Disease Control. while most people (70-80%) who become infected with West Nile virus do not develop any symptoms, about one in five who are infected will develop a fever with other symptoms such as headache, body aches, joint pains, vomiting, diarrhea, or rash. Most people with this type of West Nile virus disease recover completely, but fatigue and weakness can last for weeks or months. Less than 1 percent of people who are infected will develop a serious neurologic illness such as encephalitis or meningitis (inflammation of the brain or surrounding tissues).

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Homeowners can help, officials notes, by doing the following: 

LOOK for standing water in tires, buckets, recycling containers, tin cans, bottles, pool covers, flowerpots, birdbaths, rain barrels and wheelbarrows.

CLEAN areas where water can and will collect – gutters, empty buckets.

COVER wading pools and swimming pools. Empty water collecting on covers.

FIX leaky pipes, outside faucets where water will pool. Fix indoor screens.

EMPTY and clean birdbaths, pools.

A puddle of water left for four days can develop mosquitoes, officials note.