This is from their own protocol(see pages 67-69). My wife was in contact with someone who's had the shot, and never developed any symptoms, so I think it's still something your body can protect against. But if you are of questionable health, and do not want the vaccine, this may be your wakeup call to get healthy.
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https://media.tghn.org/medialibrary/2020/11/C4591001_Clinical_Protocol_Nov2020_Pfizer_BioNTech.pdf#page67