The Pacific Northwest outbreak includes one confirmed case in King County, where Seattle is located, and four in Multnomah County, which includes Portland, Oregon.
A person can carry measles for up to two weeks before symptoms show.
At least three of the children affected by the highly contagious disease had received their first dose of the measles, mumps and rubella (MMR) vaccine, according to KHOU.
Outbreaks, or clusters, of measles cases are typically due to exposure in foreign countries that do not have the same robust vaccination programs as the United States, Espinoza said.
The Oregon Health Authority reported that the number of measles vaccines in the last week of January tripled in the tri-county area (Multnomah, Clackamas and Washington counties).
Clark County Public Health has confirmed 50 measles cases since January 1 as part of its ongoing outbreak investigation. That includes attending church by video feed and working with employers. The virus spreads through the air and can linger for up to two hours in an isolated space.
The Vancouver Clinic, which operates medical offices and urgent-care centers in the area, reported that shots administered jumped from 263 in January 2018 to 1,444 last month, a almost 450 percent increase.
File Image: Measles vaccine prevents the disease. One person had one dose of the vaccine, which is 93 percent effective.
The department did not release any information about the person who contracted measles, citing patient confidentiality.
Multnomah County officials have reported a steep uptick in vaccinations over this time a year ago.
"Clark County Public Health is urging anyone who has been exposed at an identified location and believes they have symptoms of measles to call their health care provider prior to visiting the medical office to make a plan that avoids exposing others in the waiting room", the agency said.