A little soreness; Antibodies went from zero to 1000 after receiving a third dose; Antibodies went from zero to 1000 after receiving a third dose; This is a spontaneous report from a contactable consumer (patient). A 77-years-old male patient received bnt162b2 (COVID-19 VACCINE - MANUFACTURER UNKNOWN, Vaccine Lot Number was unknown; vaccine lot expire date was unknown), dose 3 via an unspecified route of administration, administered in the left arm on 14Jun2021 (age at vaccination was 77-year-old) as a dose 3, single for covid-19 immunisation at Pharmacy/Drug Store. The patient medical history included chronic lymphocytic leukaemia from an unknown date and unknown if ongoing Diagnosed 6 years ago; they just monitor his white blood cell count up to 60,000. He had immunodeficiency from an unknown date and unknown if ongoing He does have a Compromised immune system as far as his Chronic lymphocytic leukemia (CLL). He did have a Compromised immune system as far as his Chronic lymphocytic leukemia (CLL). There were no concomitant medications. The patient received bnt162b2 (COVID-19 VACCINE - MANUFACTURER UNKNOWN, Expiry Date: Unknown), dose 1 via an unspecified route of administration, administered in the left arm on Jan2021 around 11am (age at the time of vaccination 76-year-old) as a dose 1, single and dose 2 via an unspecified route of administration, administered in the left arm on 05Feb2021 around 11am (at the age of 76-years-old) as a DOSE 2, SINGLE both for covid-19 immunisation at Hospital. Other Products reported as No. The reporter believed he was administered all three doses in his left arm. He had no effects, just a little soreness the next day. 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) included First dose of the COVID Vaccine; Second dose of the COVID Vaccine (Lot Number / Expiry Date: Unknown). Additional Vaccines Administered on Same Date of the Pfizer Suspect considered as suspect were none. Prior Vaccinations (within 4 weeks) prior to the first administration date of the suspect vaccine(s) were None. The patient experienced antibodies went from zero to 1000 after receiving a third dose on 14Jun2021 and a little soreness on 15Jun2021. Patient did not have antibodies in his system after the first and second dose. The Reporter was reporting, this experience with the COVID vaccine. he reported that, first of all, he was 77 years old, and he had a condition called Chronic lymphocytic leukemia (CLL). He had his first 2 vaccines back in Jan and beginning of Feb. Then, somewhere like 4 months later, he got tested for antibodies twice, about a month apart. Both tests revealed he did not have any antibodies in his system. He states the tests and blood work were through withheld. He confirmed he did not have any antibodies. Recently, back in the beginning of Jun, he got a third vaccine. Nobody told him to do it, he just walked in and got a third shot. He got another antibody testing done after receiving the third vaccine and his antibodies went from zero to 1000. Reporter stated when he initially received the first two vaccines, he was 76 years old; he had a birthday in June and was now 77. His doctor (Oncologist/Hematologist) treated his Leukemia is separate. The reporter verified he did not have his vaccine record card with him to provide any details regarding the three doses he received.  He believed he received his second dose on 05Feb2021, so if you count back 3 weeks prior to that date, that was about the time he received his first dose. The third dose he received on 14Jun2021. The reporter believed he was administered all three doses in his left arm. He had no effects, just a little soreness the next day. He doesn't take any other medications at all. He knew he got the third dose on 14Jun2021 and wanted to wait a month or a little longer after getting the third vaccine. He didn't want to be tested right after the third shot. He got his lab work done around 26Jul2021 where his antibodies were at 1,000. He had his first 2 COVID vaccines back in Jan and beginning of Feb. Then, somewhere like 4 months later, he got tested for antibodies twice, about a month apart. Both tests revealed he did not have any antibodies in his system. Back in the beginning of Jun, he got a third vaccine. Nobody told him to do it, he just walked in and got a third shot. He got another antibody testing done after receiving the third vaccine and his antibodies went from zero to 1000. The reporter verified he does not have his vaccine record card with him to provide any details regarding the three doses he received. Antibodies test, he had the lab results, but doesn't have the dates of his test with him. The patient underwent lab tests and procedures which included sars-cov-2 antibody test that was 0 on 2021 and did not have antibodies in his system after the first dose, sars-cov-2 antibody test that was 0 on 2021 did not have antibodies in his system after the second dose, sars-cov-2 antibody test that were 1000 on 26Jul2021 antibodies went from zero to 1000 after receiving a third dose and white blood cell count that was unknown on an unspecified date. Reporter seriousness for the event was unspecified. Outcome of the events was unknown.  The lot number for the vaccine, [BNT162B2], was not provided and will be requested during follow up.