Health officials in Fairfax County, Virginia, have confirmed the first case of West Nile virus in a county resident this year.
The Southwest District Health Department said that the man lives in Canyon County, but may have been exposed in Adams County as well.
More information about WNV, mosquitoes in Boulder County and preventive measures can be found on the county's website, as well as the websites of the Colorado Department of Public Health and Environment and the CSU Extension.More news: Asia shares subdued for central bank, data test
"Until the hard frosts of fall set in, Halton residents should continue to protect themselves against mosquito bites and remove mosquito breeding sites", said Dr. Daniela Kempkens, Halton Region Acting Medical Officer of Health.
However, the season isn't over yet, and the number of "vector" mosquitoes is increasing as the summer moves on, he said.
"In recent years, when one human case occurs in an area, other cases often follow in the same part of the county", Fairfax officials said. But officials say to avoid false positives, which are common among such infections, a second sample will be sent to NIV in 10 days for a confirmation.More news: New search for missing Iowa student
In Maryland, there were five reported cases of West Nile past year, according to the Centers for Disease Control and Prevention. While most people do not develop any active symptoms, a few show signs similar to that of typical viral fevers. There were no reported cases of West Nile in the county previous year. Symptoms include fever, fatigue, headache, body aches, skin rashes and swollen lymph nodes.
The most vulnerable to the virus are people age 50 and older and those who have weakened immune systems because of diseases such as diabetes and cancer.
As always, eliminate standing water on your property to prevent the development of Culex tarsalis mosquito populations.More news: Russian-US dialogue crucial for global stability, says Italian PM