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“Every paralytic polio case means there are hundreds of children who are silently affected by poliovirus and are potentially carrying and spreading it throughout their communities,” she added.

No associated paralytic cases have been recorded so far.

There is no antidote to paralytic shellfish poisoning, but treatment involves supportive care and, if necessary, respiratory support.

"We find paralytic shellfish toxins in our shellfish pretty much year-round at this point."

Autopsies of people killed by lethal injection have suggested that their pain was masked, rather than reduced, by paralytics.