A number of states warn on West Nile virus danger amid peak interval

A minimum of eight state well being departments have cautioned residents over West Nile virus danger within the final week amid a seasonal peak and circumstances reported in people and animals, on the uncommon event leading to demise.

State well being officers from Connecticut, Idaho, Massachusetts, Utah, North Dakota, Louisiana, Delaware and New Hampshire launched preventive steering on West Nile virus, the main reason for mosquito-borne illness within the U.S., based on the Facilities for Illness Management and Prevention. 

The virus is commonly unfold by way of the chew of an contaminated mosquito, with circumstances sometimes occurring from summer time by way of fall. There are not any drugs or vaccines for West Nile virus and officers say one of the best ways to keep away from an infection is by stopping mosquito bites.


Dr. Philip Armstrong, a medical entomologist on the Connecticut Agricultural Experiment Station, reported a late-season surge in contaminated mosquitoes, noting that the chance of contracting West Nile virus will proceed till October, when mosquito exercise ends. The state reported a 3rd resident, aged 50-59 of Hartford, contaminated with the virus. The resident is recovering after experiencing encephalitis, officers stated.

At least eight state health departments have cautioned residents over West Nile virus risk in the last week amid a seasonal peak and cases reported in humans and animals, on the rare occasion resulting in death.

A minimum of eight state well being departments have cautioned residents over West Nile virus danger within the final week amid a seasonal peak and circumstances reported in people and animals, on the uncommon event leading to demise.

In the meantime, Idaho detected West Nile virus exercise in new areas this season, and as of as of Sept. 1 famous six human infections all involving extreme neurologic illness, together with one demise. Final 12 months, there was one reported human an infection in the identical timeframe.

“The circumstances are proper for mosquitoes to transmit the virus now till a killing frost eliminates the mosquito populations,” Dr. Leslie Tengelsen, Idaho state public well being veterinarian within the Division of Public Well being, Division of Well being and Welfare, stated in a assertion. “Idahoans ought to assume that WNV is a danger anytime and anyplace mosquitoes are energetic.”


Signs of an infection can embrace fever, headache, physique aches, nausea, swollen lymph glands and a pores and skin rash, although an infection may end up in extreme sickness, notably amongst adults age 50 and older. In extreme circumstances, an infection may cause excessive fever, extreme headache, stiff neck, altered psychological state and demise, officers observe.

Massachusetts officers introduced the 12 months’s first animal case, and 4 human circumstances earlier this month. The state additionally raised the West Nile virus danger degree from reasonable to excessive in 27 communities given rainfall, climate circumstances appropriate for mosquito exercise, human and animal infections and extra mosquitos carrying the virus.

“September is the month after we are almost definitely to see individuals get contaminated with West Nile virus,” Appearing Public Well being Commissioner Margret Cooke stated in a assertion. “Whereas we advise everybody to take steps to keep away from mosquito bites, that is particularly necessary if you’re over the age of fifty or have an immune compromising situation. It’s also necessary to know that as in a single day temperatures get cooler, mosquito exercise proper round nightfall and daybreak could also be extra intense.”

As well as, Utah reported the best variety of mosquito lure websites constructive for the virus within the state’s surveillance historical past, and North Dakota well being officers on Sept. 10 introduced the state’s first West Nile virus associated demise in 2021 in a resident over age 60 in southwest North Dakota. What’s extra, Delaware not too long ago reported a 69-year-old Kent County man contaminated with West Nile virus, the state’s first such case since 2018.


Within the wake of Hurricane Ida, Louisiana well being officers stated the state expects heavy mosquito exercise and is taking measures to tamp down breeding websites and reduce the unfold of mosquito-borne illnesses. Officers reported seven West Nile virus circumstances in 2021.

In response to Dr. Benjamin Chan, New Hampshire state epidemiologist: “Till there’s a statewide mosquito-killing frost, it stays necessary for everyone to take steps to stop mosquito bites, together with sporting lengthy sleeves, utilizing an efficient mosquito repellant on uncovered pores and skin, and avoiding outside actions at daybreak and nightfall when mosquitos are most energetic.”

Different preventive steps embrace eradicating standing water and cleansing roof gutters, repairing any broken screens in doorways and home windows and sporting insect repellents containing DEET.

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