What You Need To Know
Please find below the NJDOH vector-borne surveillance report for week 28.
Report highlights:
- Fifty-two additional mosquito pools tested positive for West Nile Virus (WNV) since last week’s report. Eighty-six mosquito pools have tested positive in 17 counties in 2025, down from 134 positive pools this week last year.
- The average number of Culex mosquitoes reported in the previous two weeks was highest in Hudson County, followed by Salem and Cumberland 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 in Sussex County in 2023.
- The number of tick-related emergency department visits 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.
Previous reports can be accessed anytime on our website at: https://www.nj.gov/health/cd/statistics/arboviral-stats/index.shtml