A second mosquito virus has appeared in Kent County

The Kent County Health Department confirmed on Wednesday that Jamestown Canyon virus was found in mosquito samples collected from the Grand Rapids ZIP code 49504, according to a report from WGVU News. The detection marks the second mosquito-borne virus identified in the county this summer.

West Nile virus was confirmed earlier in June in samples from Grand Rapids and Wyoming ZIP code 49519, the health department said. Jamestown Canyon virus had not been detected in Kent County since 2024.

What Jamestown Canyon virus means for residents

No human cases of Jamestown Canyon virus have been identified in Kent County at this time, officials said. The Centers for Disease Control and Prevention notes the virus is found across much of the United States, with most reported cases in the upper Midwest.

"These early findings tell us that mosquito season isn't just starting. It's already well underway in our community," said Sara Simmonds, Director of Kent County's Environmental Health Division, according to CBS Detroit.

Most people infected with Jamestown Canyon virus experience no symptoms. About half of those who do develop symptoms require hospitalization, according to the health department. Symptoms include fever, fatigue, and headaches. More severe cases can involve encephalitis or meningitis.

There is no vaccine or specific treatment for the virus, health officials said.

How Cascade residents can protect themselves

The health department issued these recommendations for residents in Kent County, including Cascade Township:

• Use insect repellent containing 10 to 35 percent DEET
• Wear long sleeves and pants during outdoor activities
• Eliminate standing water around homes, including refreshing water in wading pools
• Avoid outdoor activities during dawn and dusk when mosquitoes are most active

Surveillance continues through fall

The Kent County mosquito surveillance team will continue monitoring local conditions for mosquito-borne illnesses through late September, according to CBS Detroit. Routine surveillance is standard practice during this time of year.

Cascade Township residents should pay close attention to the guidance. The township sits within the broader Kent County area where both viruses have been detected in mosquito populations. While no human cases have been reported, health officials are urging residents to take prevention seriously as summer progresses.