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.

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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