Guillain- Barré syndrome (GBS) is a rare disorder in which the body’s immune system attacks the nerves. Initial symptoms usually include weakness and tingling in the hands and feet. These sensations can quickly spread, leading to paralysis of the whole body. The exact cause of GBS is unknown, but two-thirds of patients report symptoms of an infection in the six weeks preceding the onset of symptoms. These include respiratory or a gastrointestinal infection or Zika virus.