According to Public Health — Seattle & King County, it has been informed of two new measles cases in King County residents from the same household.

One of the individuals — either a child or an adult family member — visited Mercer Island’s Mary Wayte Pool on June 18 prior to confirming their diagnosis. One or both of the individuals were also present at other Eastside locations between June 14-20 before their diagnoses were confirmed.

“They may have exposed others to the measles virus at multiple locations throughout Bellevue, Issaquah, Mercer Island, Newcastle and Seattle,” reads Public Health’s Public Health Insider on June 25. “People who are vaccinated are very well protected,” reads one of its social media posts.

A Public Health time chart lists that one of the individuals visited the Mary Wayte Pool between 1 p.m. and 4 p.m. on June 18.

Mary Wayte Pool General Manager Keith Freeman said they were alerted of the situation on June 25 by receiving a letter from Public Health.

“The person had been in our building and we were notified by the health department yesterday that there was a possible exposure here. We have reached out and notified the people that were in the building during that time frame and let them know that they should be on the watch for signs and symptoms of measles that the health department gave us,” Freeman said.

He added that, “Nobody has reached out to us concerned about it since we sent out our notice yesterday afternoon.”

The letter reads that measles is very contagious and causes cough, runny nose, red eyes, fever and rash. Public Health’s Insider notes that the child had received one dose of the MMR vaccine, and the adult family member’s vaccination status is unknown.

Public Health said the pair was likely exposed to measles while hosting an international visitor who reported being ill and has since left King County. Their measles status is unknown.

“These two cases are not connected to any of the previously announced local measles cases. These are the ninth and tenth cases of measles in Washington state residents in 2025,” Public Health said.

For more information and complete time chart and locations, visit: https://tinyurl.com/452h6smx