What You Need To Know
Please find below the NJDOH vector-borne surveillance report for week 37.
Report highlights:
- NJDOH is reporting four new West Nile Virus (WNV) human cases. To date there are ten cases with additional reports under investigation and three presumptive viremic blood donors (PVD). No animal or avian cases of WNV have been reported.
- Fifty-seven additional mosquito pools tested positive for WNV since last week’s report, for a total of 1,002 positive mosquito pools, which exceeds 2024 levels. The number of weekly detections in mosquitoes started to decline in week 36.
- The average number of Culex mosquitoes reported in the previous two weeks was highest in Hudson and Union counties (data unavailable for five southern 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 additional mosquito pool tested positive for Eastern Equine Encephalitis (EEE) in Burlington County. To date, four mosquito pools have tested positive for EEE, all in southern NJ, three for Jamestown Canyon Virus (JCV), and two for La Crosse Encephalitis Virus (LAC). There have been no human or animal cases of EEE, JCV or LAC in 2025.
- There have been two cases of Powassan virus (POWV) reported in Morris and Monmouth counties and one case of malaria under investigation lacking relevant international travel history.
- The number of anaplasmosis and babesiosis cases has exceeded 2024 totals. Tick-related emergency department visits increased slightly from the previous week.
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