Three Multnomah County residents are confirmed to have been diagnosed with measles. That brings the total number of measles cases in Oregon up to four.

The three individuals involved in the new cases were in close contact with the first Multnomah County resident who tested positive for measles Jan. 25, according to the Oregon Health Authority.

The people involved in these new cases stayed home while contagious, so there are no new public exposure sites where people might have come in contact with the disease.

“These individuals did everything right,” said Jennifer Vines, M.D., deputy health officer with Multnomah County. “They stayed away from others while on symptom watch, so we have no new public exposures to measles.”

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). Measles vaccinations rose from 200 per day in January 2018 to 600 per day in January 2019. 

The Oregon cases are a part of the larger Vancouver-area outbreak that stands at 50 confirmed cases of measles and 11 suspected cases as of Wednesday, according to Clark County Public Health.

Clark County also reported three new exposure sites, all of which are medical facilities in Vancouver — the Vancouver Clinic Salmon Creek, the Sea Mar Medical Clinic Salmon Creek and the Legacy Salmon Creek Medical Center Emergency Department. 

A full list of exposure sites can be found here.