Officials with the Maryland Department of Health said in a statement that the infected person lives in the Baltimore region.
According to the Fairfax County Health Department, an adult resident living in the northeastern part of Fairfax County was hospitalized from the virus.
"Luckily, the summer to this point hasn't been extremely wet, which has limited prime breeding conditions for mosquitoes", Callanan said.
"With record levels of West Nile virus activity in mosquitoes already found, we are at increased risk of disease from a bite of a mosquito", said DEP Secretary Patrick McDonnell.
Last year, Toronto Public Health did not record the first lab-confirmed case of West Nile virus until August 25.
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The number of confirmed infections can vary from year to year. In Virginia, there were 13, and in the District, there were four.
Symptoms associated with West Nile virus typically appear 3 to 14 days after infection. According to the Centers for Disease Control and Prevention, most people infected with the virus may not show any symptoms but some may experience fever along with body aches, joint pain, headaches, vomiting and diarrhoea.
Less than 1 percent of infected people develop the sometimes fatal neuro-invasive illness.
Homeowners are also asked to eliminate standing water by cleaning eaves troughs, emptying bird baths, covering rain barrels with mosquito screens, getting rid of containers that collect water and landscaping for better drainage.
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.