Although the specific causes of Guillain-Barre syndrome are unknown, certain infections and conditions appear to trigger the onset of Guillain-Barre syndrome. Campylobacter, a bacteria often found in undercooked poultry, is one of the most common triggers. Mononucleosis, HIV, and Epstein-Barr virus, as well as Hodgkin's disease have also been connected to the onset of Guillain-Barre syndrome. Recent surgery and, rarely, flu shots have triggered the onset of Guillain-Barre syndrome.
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Honor Society of Nursing (STTI) answered
Certain viral infections such as cytomegalovirus, Epstein-Barr virus, smallpox-vaccinia, hepatitis B or C, and HIV, bacterial infections such as Campylobacter jejuni, vaccinations, surgery, and toxins may all trigger Guillain Barre Syndrome (GBS).