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"We're trying to figure out what the triggers are of what causes someone to get AFM," a CDC official says.
So far 62 acute flaccid myelitis cases—marked by sudden limb weakness—have been confirmed.
Minnesota recently reported 6 cases, and some of Colorado's cases were associated with EV-D71.
A 20-study meta-analysis finds good evidence of an association between the virus and acute flaccid myelitis.
Last year saw a surge of 136 AFM cases in 37 states.
A recent surge may be linked to a cluster of suspected cases in Washington state.
The virus was found in half the acute flaccid myelitis patients studied, and earlier testing may have identified more, say authors.
The study supports but doesn't prove a link between polio-like symptoms and EV-D68 in kids.
AFM cases now total 103, while EV-D68 cases have reached 1,153, including 13 deaths.
Neuroepidemiologist calls evidence of a connection "pretty convincing," but proof is still being sought.
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