SEATTLE (AP) — A 6-month-old child seen at Seattle Children’s Hospital has been confirmed with the eighth case of measles in the Puget Sound area.

It’s the fifth measles case in King County this month.

The baby contracted the disease from someone in her household.

Health officials say the only place they know the child might have exposed people was in the Seattle Children’s emergency room around mid-day Friday.

The measles virus can linger in the air for up to two hours.

Seattle Children’s has notified families in the emergency department who may have been exposed.