A new strain of a common respiratory virus may be responsible for partly paralyzing scores of children nationwide, researchers reported on Monday.

Since August, 115 children in 34 states have developed polio-like paralysis in an arm or a leg. The virus, enterovirus 68, has emerged as a leading suspect.

A study published Monday in the journal Lancet Infectious Diseases strengthens that possibility, although many questions remain.

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Researchers at the University of California, San Francisco, analyzed genetic sequences of enterovirus 68 cultured from 25 children in Colorado and California with limb paralysis, also called acute flaccid myelitis.

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