New Jersey health officials have confirmed the first human cases of West Nile virus in New Jersey in 2025, and they’re warning residents to take extra precautions when they’re outdoors. 

With high mosquito activity across the state this season, the risk of exposure is real, even if most people never even show any symptoms.

The initial West Nile cases in NJ include a child in Atlantic County and an adult in Middlesex County, plus an asymptomatic blood donor in Sussex County. 

Several other suspected cases are still being investigated. Officials say these reports line up with what they’re seeing in mosquito testing – hundreds of samples have come back positive for the virus.

Officials Warn of Dangerous Virus After West Nile Cases Emerge in New Jersey

For most, infection causes little to no illness. But some people do develop West Nile virus symptoms, including:

• Fever and chills

• Headaches and body aches

• Rash, nausea, or vomiting

In rare cases, the virus can lead to serious neurological problems like high fever, neck stiffness, tremors, or paralysis. 

People over 50 and those with a weakened immune system are more vulnerable to severe illness, which is why New Jersey health officials are stressing early intervention.

Why There’s a Mosquito-Borne Illness Warning

Mosquito traps across the state have shown unusually high levels of the virus, prompting a clear warning. In fact, all 21 New Jersey counties have reported positive mosquito pools this season.

While last year saw more than 40 human cases and several deaths, health officials say this year’s mosquito numbers are particularly concerning. 

Warm, wet weather can stretch mosquito season into November, giving the insects even more time to spread the virus.

West Nile Prevention Tips Everyone Can Use

There’s no vaccine for West Nile, which means protection comes down to good habits. The most important prevention tips are simple:

• Apply insect repellent whenever you’re outdoors.

• Wear long sleeves and pants, especially at dawn and dusk when mosquitoes are most active.

• Check that window and door screens are intact.

• Dump standing water around your home, including birdbaths, buckets, clogged gutters, and even flowerpots; they can all breed mosquitoes.

• Cover strollers and playpens with netting to protect children.

These small steps can make a big difference when it comes to reducing your risk.

How New Jersey Health Officials Are Responding

New Jersey health officials' virus updates show that agencies are working together to monitor mosquito activity, control breeding sites, and keep the public informed. 

The Department of Health, the Department of Environmental Protection, and local mosquito commissions are coordinating their surveillance and prevention efforts.

Public reminders will also continue throughout the season, urging people not to let their guard down, even as the weather cools.

Staying Safe with West Nile Virus in New Jersey in 2025

The first human cases of West Nile virus in New Jersey in 2025 are a reminder that mosquito season isn’t just an irritation. It carries real health risks. 

While most infections are mild, the potential for severe illness means prevention is worth the effort. Repellent, protective clothing, and eliminating standing water are your best defenses.

Stay alert, take precautions, and follow updates from New Jersey health officials to keep yourself and your family safe throughout the rest of this troublesome mosquito season.