Colorado health officials on Monday reported the state’s first human case of West Nile virus this year, as cases have been confirmed nationwide.
The Department of Public Health and Environment said the case was found in one person in La Pata County, as well as in mosquitoes in seven counties.
“Mosquito populations are at historic levels in some parts of the state due to heavy rains this year. This unusual mosquito activity coupled with the known presence of the virus increases the risk of transmission of West Nile virus to humans,” the department warned.
Last year, more than 200 human cases of West Nile virus were reported in Colorado, including 20 deaths.
West Nile virus has been reported in several states.
The advisory comes after cases were found in a person from Tulare County, California, and a person in Dallas County, Texas.
California’s Department of Public Health warned in June that residents should take extra precautions after heavy rain there caused a population increase.
West Nile Virus Season: What You Should Know About Spread, Symptoms, and Prevention
The U.S. Centers for Disease Control and Prevention, which tracks such cases nationwide, had reported 47 cases of West Nile virus human disease as of July 18 this year.
The agency showed more than 1,125 cases of human diseases in 2022.
West Nile virus cases Occurs during the mosquito season, which begins in the summer and continues through the fall.
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There are no vaccines or drugs to prevent the virus — a member of the flavivirus genus — in people, but the CDC notes that most people infected do not feel sick.
About one in five infected people develop fever and other symptoms., And about one in 150 infected people develop serious and sometimes fatal disease.