Public Health Info: New Jersey DOH Vector-borne Surveillance Report, Week 27

What You Need To Know

Please find below the NJDOH vector-borne surveillance report for week 27.

Report highlights:

Eleven additional mosquito pools tested positive for West Nile Virus (WNV) since last week's report; four in Bergen County, three each Hudson and Middlesex counties, and one in Morris County. Thirty-four mosquito pools have tested positive in twelve counties in 2025.
The average number of Culex mosquitoes reported in the previous two weeks was highest in Hudson County, followed by Cumberland and Middlesex counties. Culex mosquitoes are predominantly responsible for WNV transmission and are often found around the home, taking advantage of standing water sources (e.g., buckets, wheelbarrows, tarps).
There have been no human or animal cases of WNV and no human, animal, or mosquito detections of Eastern equine encephalitis (EEE) or Jamestown Canyon virus (JCV) in 2025.
One mosquito pool tested positive for La Crosse Encephalitis Virus (LACV) in Sussex County in week 26. The last LACV positive pool was also found in Sussex County in 2023.
The number of tick-related emergency department visits continued to decline and is consistent with the 5-year average.

N.J. vector-borne disease data is available online: https://dashboards.doh.nj.gov/views/public_dashboard/Intro and can be accessed on the “Fight the Bite N.J.” webpage: https://www.nj.gov/health/cd/topics/vectorborne.shtml.