(NEWSER) – Public health officials are mystified by an outbreak of a polio-like illness that has left at least 25 children in California with paralyzed limbs. The affected children are hit quickly with severe weakness or paralysis, sometimes after a respiratory illness, the Los Angeles Times reports. The first case surfaced in 2012 and none of the sick children, whose median age is 12, have recovered limb function. Doctors say they're certain it's not polio—which all the children had been vaccinated against—but they suspect it could be a new strain of an enterovirus from the same family as polio.

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