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Infection with influenza virus itself increases both the risk of death ( up to 1 in 10,000 ) and increases the risk of developing Guillain–Barré syndrome to a far higher level than the highest level of suspected vaccine involvement ( approximately 10 times higher by 2009 estimates ) .
 Guillain–Barré syndrome
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Guillain–Barré syndrome