A Grant County resident has hantavirus pulmonary syndrome.
The person — whose name, age and gender weren't released — is out of the hospital and expected to fully recover, the Grant County Health District reported.
Officials announced the case earlier this month, but lab tests hadn't yet been completed. The diagnosis now is confirmed.
Hantavirus is found in the urine, droppings and saliva of infected rodents, and it can lead to hantavirus pulmonary syndrome, a rare but serious illness.
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In 2012, two people in Grant County died from it.
Deer mice are the only hantavirus carriers in Washington. People can become infected by breathing in or touching contaminated particles, and also from rodent bites.
The illness isn't spread person-to-person.
The Grant County patient is believed to have been exposed to mouse droppings while cleaning out a car.