By CATHERINE SAINT LOUIS
OCT. 28, 2014
A 4-year-old boy who had experienced episodes of paralysis underwent physical therapy on Tuesday
in Charlestown, Mass. Credit Kayana Szymczak for The New York Times
The cause is not known, although some doctors suspect the cases may be linked to infection with enterovirus 68 , a respiratory virus that has sickened thousands of children in recent months.
Concerned by a cluster of cases in Colorado, the C.D.C. last month asked doctors and state health officials nationwide to begin compiling detailed reports about cases of unusual limb weakness in children. Experts convened by the agency plan next week to release interim guidelines on managing the condition.
That so many children have had full or partial paralysis in a short period is unusual, but officials said that the cases seemed to be extremely rare.