West Nile Virus Summary Data - NYC Health

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West Nile Virus Summary Data

The NYC Department of Health routinely analyzes surveillance and control data from previous years in order to better prepare for the upcoming mosquito season. The key to the Health Department's planning efforts is a primary emphasis on prevention. The Health Department devotes considerable resources to a citywide effort to prevent mosquito breeding, while enhancing existing disease surveillance, and public and medical provider education activities.

Although mosquitoes are most active in New York City from May through October, our strong mosquito prevention, surveillance and control efforts are year-round activities. The current Comprehensive Mosquito Surveillance and Control Plan is founded on the principles of Integrated Pest Management.

2025 Positive Results Summary

West Nile virus season has ended in NYC. Updates will be posted when West Nile virus season resumes.

Data by Year

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2024

West Nile Virus 2024 Positive Results Summary

Comprehensive Mosquito Surveillance and Control Plan 2024 (PDF)

2023

West Nile Virus 2023 Positive Results Summary

Comprehensive Mosquito Surveillance and Control Plan 2023 (PDF)

2022

West Nile Virus 2022 Positive Results Summary

Comprehensive Mosquito Surveillance and Control Plan 2022 (PDF)

2021

West Nile Virus 2021 Positive Results Summary

Comprehensive Mosquito Surveillance and Control Plan 2021 (PDF)

Multi-Year

Summary of Human West Nile Viral Disease in NYC 1999-2024