He tested positive for COVID-19 infection; He tested positive for COVID-19 infection; developed Atrial Fibrillation; his heart rate had increased quite a substantial amount; His blood pressure has dropped so low; feeling hoarse; his throat was dry; This is a spontaneous report from a contactable consumer or other non hcp. A 69-year-old male patient received bnt162b2 (COMIRNATY, Formulation: solution for injection, Batch/Lot number: EN6206, Expiration date was not reported), dose 2 via an unspecified route of administration, administered in Arm Left on 09Mar2021 (age at vaccination 69-years) as dose 2, single for covid-19 immunization and first dose of bnt162b2 (Comirnaty) for covid-19 immunization (batch number: EN6201) on 16Feb2021. The patient medical history and concomitant medications were not reported.   On 25Aug2021 the patient experienced tested positive for COVID-19 infection. On an unspecified date in 2021 patient developed atrial Fibrillation, his heart rate had increased quite a substantial amount, his blood pressure has dropped so low, feeling hoarse, his throat was dry, he did lose his smell and taste. Clinical course: He tested positive for COVID-19 infection in Aug2021. He then developed Atrial Fibrillation. He read online that people who had the vaccine and who developed the infection after within days of isolation, had a higher heart rate which is associated with atrial fibrillation. This is report 1 of 2. Consumer received both doses of the Pfizer BioNTech COVID-19 vaccines in March. In August, specifically on 25Aug2021, he was tested positive for COVID-19. He quarantined himself for 2 weeks. The third week he went to the gym and noticed his heart rate had increased quite a substantial amount. He was at resting heart rate of 120-130 beats per minute. He had discovered he developed A-fib, so he was looking to make sure that gets documented. He doesn't think the vaccine had anything to do with his diagnosis of A-fib. He is just wanting to know if Pfizer had information on the breakthrough COVID infections. He read some information and he knows Pfizer is really on top of this, but he is not thinking his A-fib has anything to do with the vaccine. His blood pressure has dropped so low and his heart rate is so high, and the caller wants to know does Pfizer have more information, maybe through other studies. The caller confirms his second dose was 09Mar2021. He verifies there is no other information including NDC, expiration date or dosing information on his vaccine record card. He clarifies he did a leg workout on 25Aug2021 and that is when he came down with symptoms and had the problem, clarified as A-fib. He was working out his legs again for the second time and noticed the A-fib. He is guessing he didn't write it down but he believed he was diagnosed with A-fib on 08Sep2021.The callers states he believes he came down with symptoms of COVID on 25Aug2021, but he didn't really think he had COVID at that point. He slept with a fan and he woke up feeling hoarse and his throat was dry, but he assumed that was just because of the fan blowing. He states it wasn't until 27Aug2021 that he was tested and tested positive. He mentioned he did lose his smell and taste so he knew it was COVID.   Description of Product Complaint: Description of complaint: Consumer received both doses of the Pfizer BioNTech COVID-19 vaccines in March. In August, specifically on 25Aug2021, he was tested positive for COVID-19. The callers clarifies he believes he came down with symptoms on 25Aug2021, but he didn't really think he had COVID at that point. He slept with a fan and he woke up feeling hoarse and his throat was dry, but he assumed that was just because of the fan blowing. He states it wasn't until 27Aug2021 that he was tested and tested positive. He mentions he did lose his smell and taste so he knew it was Covid. The patient underwent lab tests and procedures which included blood pressure measurement: decreased on 25Aug2021, heart rate: 120-130 on 25Aug2021 and resting heart rate of 120-130 beats per minute, sars-cov-2 test: positive on 25Aug2021. Outcome of all the events was unknown.