Public Health Info: New Jersey DOH Vector-borne Surveillance Report, Week 31

What You Need To Know

Please find below the NJDOH vector-borne surveillance report for week 31.

Report highlights:

One hundred twenty-three additional mosquito pools tested positive for West Nile Virus (WNV) since last week’s report, for a total of 384 positive mosquito pools in 19 counties.
The average number of Culex mosquitoes reported in the previous two weeks was highest in Hudson County, followed by Union and Salem 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).
Three mosquito pools have tested positive for Jamestown Canyon Virus (JCV) in Morris (2) and Sussex counties. One mosquito pool tested positive for La Crosse Encephalitis Virus (LACV) in Sussex County in week 26.
There have been no human or animal cases of WNV or JCV and no human, animal, or mosquito detections of Eastern equine encephalitis (EEE) in 2025.
There was one case of Powassan virus (POWV) in week 21 from Morris County. There were two cases of POWV in 2024 in Morris and Sussex counties.
The number of tick-related ED visits continued to decline but is above 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.