If you read any article or hear anyone speak as though something is true without facts to back up the article/speaker is not trustworthy.
Sometimes people put toothpick in their mouth and then have a heart attack. Does that mean I can say toothpicks can cause a heart attack? What evidence is there to support this proposal? So far only the close proximity in time.
In a crisis sometimes you have to trust the sound of a fire alarm. When you read something presented as fact with no evidence to support it there is no basis to trust, believe or react like you just heard a fire alarm.
I have taken the Pfizer vaccine and will have a serology test for the antibodies added to my next blood test.
Read the articles on how the vaccines are produced and other areas where this technique is used to illicit positive immune responses.