[Answered]: What cognitive bias does this reasoning exhibit

What cognitive bias does this reasoning exhibit? I just got a flu shot at my local clinic, but Betty refused to get one when she went to her doctor. We had both been worried about bad side effects. I told her that my clinic nurse practitioner told me that out of 100 people getting a flu shot, 98—99 people have no side effects at all. That sounded good to me. Betty said, “Wow—that’s not what my doctor told me. She said that 1—2% of people who get the flu shot have fever or aches as a result. I don’t have time to be sick, so I didn’t get it”.