Mosquito Pools Test positive for West Nile Virus in NJ   
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Mosquito Pools Test positive for West Nile Virus in NJ

What You Need To Know

  • Three mosquito pools have tested positive for West Nile Virus (WNV) in Bergen, Somerset and Union counties this year. As of June 2023, there have been no known human or animal cases of WNV in New Jersey. NJDOH began testing mosquitoes for the virus in May 2023 and has tested mosquitoes from all 21 counties in New Jersey.
  • For 2023, cases of Lyme disease are reportedly lower than the amount of cases reported in 2022. A total of 2,704 cases of Lyme diseases have been reported for 2023 in all 21 counties. For Week 25, this year is lower than the number of cases reported in 2022.
  • 2023 New Jersey tick-related emergency department visits are similar to cases reported in 2022; however, cases are still below the 5-year average.
  • For New Jersey chikungunya cases, cases reported in 2023 are higher than cases reported in 2022 due to an outbreak in South America. Due to the timeline for public health investigations, the number of tick borne diseases (excluding Lyme disease) may be lower than actual counts. 2023 numbers are preliminary and are subject to change.

For More Information

To view up-to-date reports on vector-borne disease data, information is now available on an online dashboard at Previous reports are available at
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