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Most people with Guillain-Barré syndrome experienced some form of viral or bacterial infection before the onset of symptoms.

Pins and needles is a sensation of uncomfortable tingling or prickling, usually felt in the hands or feet.

Zika virus is a mosquito-borne virus. There is no cure, specific treatment or vaccine for Zika virus.

Porphyria can affect the skin, nervous system, gastrointestinal system or all of these, depending on the specific type.