IgM and IgG (antibodies not detected) and stated that it does not preclude acute sars-cov 2 infection; he experienced a little bit of soreness,runny nose, coughing up phlegm,Around 09Apr2021 he lost his taste and smell; His doctor told him his D dimer was elevated.; This is a spontaneous report from a contactable consumer (patient). A 64-years-old male patient received bnt162b2 (BNT162B2), dose 1 via an unspecified route of administration, administered in Arm Left on 17Mar2021 11:30 (Batch/Lot Number: EN6207; Expiration Date: 31Jul2021) as SINGLE DOSE for covid-19 immunisation. Medical history included history of COPD treated by CPAP, high blood pressure, Cancerous tumors removed from bladder- He is cancer free, atrial fibrillation (From: 28Feb2021 To: Ongoing), In Feb2021, prior to receiving his first dose of the Covid 19 vaccine he had some heart problems. He had gone into atrial fibrillation. His doctor prescribed Eliquis and put him on a heart monitor. He took a nuclear stress test and that was ok and now he's wearing a heart monitor. Concomitant medication(s) included lisinopril (LISINOPRIL) taken for an unspecified indication from an unspecified start date and ongoing; metoprolol (METOPROLOL) taken for an unspecified indication from an unspecified start date and ongoing; apixaban (ELIQUIS) taken for atrial fibrillation from Feb2021 and ongoing. History of all previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available) was none. No additional Administered Vaccines on same date with the Pfizer vaccine considered as suspect. No Prior Vaccinations (within 4 weeks). No AE(s) following prior vaccinations. The patient received the 1st dose of the Pfizer covid vaccine on 17Mar2021, he experienced a little bit of soreness, no complaints, no issues. He was scheduled for the 2nd shot on 09Apr2021 or somewhere. However, on 04Apr2021, he started having a runny nose, coughing up phlegm. He has a history of COPD treated by CPAP. He lost his sense of smell and taste. On 7 or 8Apr2021, he took a covid test. He did not get 2nd shot. Covid test results were negative: IgM and IgG (antibodies not detected) and stated that it does not preclude acute sars-cov 2 infection. The D-dimer part of the blood work came back as 0.44 (reference says it should be less than 0.5). A t the end of Feb 2021, he had A-Fib treated by Eliquis. The doctor said it should be 0 if on Eliquis, but attributes that result to him taking the Pfizer vaccine and explaine dit as a higher blood clot risk. His 2nd shot is scheduled for tomorrow. He was told by the doctor to wait until mid May and start all over again with the [Redacted]. Caller would like to know whether increased blood risk has been reported as related to the covid vaccine. Referenced EUA Fact sheet for HCPs under section 6 OVERALL SAFETY SUMMARY, Unsolicited Adverse Events: There were no other notable patterns or numerical imbalances between treatment groups for specific categories of serious adverse events (including neurologic, neuro-inflammatory, and thrombotic events) that would suggest a causal relationship to Pfizer-BioNTech COVID-19 Vaccine. The patient wanted to know it is normal to test negative for antibodies after his initial dose. Caller requesting assistance interpreting his blood work results. Provided basic information and referred caller to his HCP for interpretation of his results. The patient had his first Covid 19 vaccine on 17Mar2021. He had no issues with the first vaccine. About 2 weeks after he received his first Covid 19 vaccine maybe around 01Apr2021 he started sneezing, having some phlegm, and coughing stuff up. He does use a CPAP machine at night. Around 09Apr2021 he lost his taste and he lost his smell. He was scheduled for his second Covid 19 vaccine on 10Apr2021 but thought his symptoms were worse than he originally thought. He went to his doctor on 09Apr2021. His doctor did the nasal swab for the Covid 19 virus. He never had a fever or chills. His doctor gave him some erythromycin. He also did some blood tests. His Covid 19 virus test came back negative. On the results of his blood tests on the first page, the first thing it says are that his Covid 19 results are negative. His doctor told him that his body showed no response to the Covid 19 vaccine. He doesn't see that this blood test is testing for antibodies. Later in his blood test paperwork he sees that it says "antibodies not detected, does not preclude acute Sars-Cov-2 infection". His paperwork says IgG and IgM were negative. He provides the following in a historical context. In Feb2021, prior to receiving his first dose of the Covid 19 vaccine he had some heart problems. He had gone into atrial fibrillation. His doctor prescribed Eliquis and put him on a heart monitor. He took a nuclear stress test and that was ok and now he's wearing a heart monitor. He's reading from his blood test results. His D-dimer result was 0.44. In the reference range it says anything less than 0.50 is a normal range. But he is taking Eliquis and his doctor told him his D-dimer should be zero. His doctor told him his D dimer was elevated. His doctor believes the first Covid 19 vaccine has something to do with his D-dimer result. The caller reports that he has heard about the [Redacted] and [Redacted] vaccine and blood clots but he hasn't heard anything about Pfizer having problems with blood clots or anything of that nature. His doctor told him that his body showed no response to the Covid 19 vaccine.  Later in his blood test paperwork he sees that it says "antibodies not detected, does not preclude acute Sars-Cov-2 infection". His paperwork says IgG and IgM were negative. AE(s) did not require a visit to Emergency Room/Physician Office. The primary infection site was Unknown. There were no predisposing factors. A culture was not performed. Outcome of the events was unknown.  No follow-up attempts are needed. No further information is expected.