Guillian Barre and fertility

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Ladies- I can not find a single piece of information or research our there to answer my question. My boyfriend developed Guillian Barre Syndrome almost a year ago now and is just starting to begin rebuilding his muscle that he lost while paralyzed. We have one daughter together who turns one next month. My question is: does Guillian barre affect sperm quality or motility? We want more children in the future but this is something that just crossed my mind. Anything will help. Thank you.