The department says two residents in Queens have been infected, one was hospitalized briefly and discharged while the other remains hospitalization with encephalitis, an infection of the brain.
In addition, the virus was detected in blood donations from two individuals, one a resident of Brooklyn the other of Staten Island.
The virus has been found in mosquito pools across all five boroughs in the city since July.
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Health officials spray regularly in neighborhoods to reduce the risk of mosquito activity.
They say mosquitoes infected with West Nile virus are typically present in New York City from May through October, with peak activity during August and September.
While most people infected with West Nile virus show no symptoms, the disease can be dangerous for people over 55 or those with weakened immune systems. Common symptoms include fever, headache and vomiting.
A few tips for those looking to prevent annoying insect bites and stay safe from mosquito-borne illnesses:
- Use an approved insect repellent containing DEET, picaridin, oil of lemon eucalyptus (not for children under 3), or products that contain the active ingredient IR3535.
- Make sure windows have screens. Repair or replace screens that have tears or holes.
- Mosquitoes breed by laying their eggs in standing water. New Yorkers can report standing water by calling 311 or visiting nyc.gov/health/wnv. Eliminate any standing water from your property and dispose of containers that can collect water.
- Make sure roof gutters are clean and draining properly.
- Clean and chlorinate swimming pools, outdoor saunas and hot tubs. Keep them empty or covered if not in use. Drain water that collects in pool covers.
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