The Washington Department of Heath says all the children are 6 or younger.
Symptoms include a sudden onset of limb weakness, loss of muscle tone and reflexes, facial droop, difficulty moving eyes, drooping eyelids, difficulty swallowing, and slurred speech.
The first five possible cases affected children in King, Pierce, Lewis and Snohomish counties.
Recent cases in NYS have been confirmed among individuals who reside in Western and Central New York, the Capital Region and Long Island, and specimens have been received from other regions for specialized testing at Wadsworth. Since then, at least 362 cases have been reported across the country, according to the federal agency. "We will continue to work with our partners at the CDC and local health departments to make sure that all NY families have the information they need to prevent their children and others from getting the virus".
The Centers for Disease Control says there have been 38 confirmed cases of AFM in 16 states so far this year. According to the CDC, the largest number of cases, about 50, were reported in September 2014 before dropping to single digits in following months.
Former Foreign Affairs Minister, Pik Botha dies
He then joined Mandela's cabinet after the end of white-minority rule and the country's first non-racial election in 1994. His son, Piet Botha confirmed to South African media that his father died in his sleep during the night.
There is no specific treatment for AFM, but a neurologist may recommend certain interventions on a case-by-case basis.
Earlier this week, six children in Minnesota were diagnosed with this "rare" disease.
The disease is not new but the cause remains unknown. It is most commonly diagnosed in children.
Numbness or tingling is rare in patients with AFM, but some patients have pain in their arms or legs.
Some viruses and germs have been linked to AFM, including common germs that can cause colds and sore throats, and respiratory infections.