Public Health Info: New Jersey DOH Vector-borne Surveillance Report, Week 29

What You Need To Know

Please find below the NJDOH vector-borne surveillance report for week 29.

Report highlights:

Fifty-seven additional mosquito pools tested positive for West Nile Virus (WNV) since last week’s report. 143 mosquito pools have tested positive in 18 counties in 2025, down from 227 positive pools this time last year.
The average number of Culex mosquitoes reported in the previous two weeks was highest in Hudson County, followed by Cumberland 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).
One mosquito pool tested positive for Jamestown Canyon Virus (JCV) in Sussex County in week 29. In 2024 there were four total JCV pools, two each in Cumberland and Monmouth counties.
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.
One mosquito pool tested positive for La Crosse Encephalitis Virus (LACV) in Sussex County in week 26. The last LACV positive pool was in Sussex County in 2023.
The number of tick-related ED visits continued to decline but is slightly 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.