| CDC 
				officials have said they do not know what causes acute flaccid 
				myelitis or AFM, which affects the nervous system and triggers 
				weakness and even paralysis in one or more limbs. The vast 
				majority of patients are children.
 In 2014, when 120 patients were diagnosed, the CDC began 
				investigating cases of the disease, which it estimates affects 
				one out of 1 million people in the United States.
 
 Since 2014, the number of cases has spiked every two years in 
				the United States. Last year, the nation had 33 confirmed cases, 
				while in 2016 it had 149.
 
 "It is pretty concerning that it's going up and we still haven't 
				figured out specifically how to prevent this or how to treat 
				it," Dr. Emmanuelle Tiongson, pediatric neurologist at 
				Children's Hospital Los Angeles who has evaluated and treated 
				patients with the condition, said in a phone interview.
 
 One phenomenon researchers have observed is the illness is 
				particularly prevalent between August and October, a period when 
				many viruses commonly circulate, according to the CDC.
 
 The disease could be spread through infection, which would 
				explain why there have been clusters of cases in certain states, 
				Tiongson said.
 
 The CDC on Monday provided a state-by-state breakdown of cases 
				for the first time this year.
 
 Colorado reported 15 confirmed cases of the disease and Texas 
				had 14, followed by Pennsylvania, Ohio, Washington state and 
				Minnesota, which each had eight cases, according to the CDC.
 
 States with large populations or good methods for reporting the 
				disease are more likely to have a larger number of cases, 
				according to the CDC.
 
 In some patients, the partial paralysis they suffer due to the 
				illness will be a lifelong condition, Tiongson said.
 
 (Reporting by Alex Dobuzinskis in Los Angeles; Editing by Lisa 
				Shumaker)
 
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