According to the state Department of Health, the two patients - one in Snohomish County and one in King County - were both diagnosed with Multisystem Inflammatory Syndrome in Children (MIS-C) associated with Covid-19.
One patient is under the age of 10 and the other is between 10 and 19 years old. NY has seen over 100 suspected cases, and in the United Kingdom, at least one child has died from it. A few children have died.
The Centers for Disease Control and Prevention, which also refers to the syndrome as MIS-C, has listed the illness on its website, but says openly, "CDC is still learning about MIS-C and how it affects children, so we don't know why some children have gotten sick with MIS-C and others have not".
According to the Washington State Department of Health, healthcare providers in the United Kingdom were the first to recognize cases of MIS-C in late April.
The new syndrome has symptoms similar to Kawasaki disease, with doctors recording symptoms like swelling of hands and feet, swollen lymph glands in the neck and inflammation of the mouth and lips.
"In Washington, we are tracking this issue closely and working with local health departments and providers to learn more", said Dr. Kathy Lofy, state health officer for DOH.
"Last Thursday there were seven countries that also investigated and found cases; there were 17 states that also found cases". The agency said it is working with "US and worldwide scientists, healthcare providers and other partners to learn more about this new syndrome. creating a system to track cases and providing guidance" to health care providers among others.
"Although it remains very uncommon, parents should call their primary care providers if their children are showing new or unusual symptoms, such as a persistent fever or headache, abdominal pain with or without diarrhea, fatigue, and respiratory symptoms such as shortness of breath", said Dr. John McGuire, chief of the Division of Pediatric Critical Care Medicine at Seattle Children's.
Public health officials said they will not release any additional information about the Washington state cases, citing privacy concerns.
However, between four and 16 per cent of children who have had COVID-19 have not had any symptoms, he said.
"Studies in China have shown children are just as likely to acquire COVID-19 from household contacts as are adults", Kurji added.