​Several doctors have tweeted on X, formerly Twitter, about rising cases of GBS. They say a surge in GBS cases recently is common during this season. Several people have said that their doctors have explained to them that GBS might be due to COVID or vaccination. GBS or Guillain-Barré syndrome is a rare neurological disorder in which the body's immune system attacks parts of the peripheral nervous system. Usually, bacterial or viral infection triggers this disease.​