my brain does not seem to be functioning right because all of the sudden I will be talking, and I won't be able to reach the word; I had another booster, I think in about November or I had another booster, I think in about Nov2022 or Dec2022 and I had the last one just this past week, which was a booster shot I think; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  An 80-year-old male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), in Apr2023 as dose 6 (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Bnt162b2 (DOSE 1, SINGLE, I take the first one was probably in the fall of 2021), administration date: 2021, for COVID-19 immunization; Bnt162b2 (DOSE 2, SINGLE), for COVID-19 immunization; Bnt162b2 (DOSE 3 (BOOSTER), SINGLE, I had a booster I think in about Mar2022 or Apr2022.), administration date: 2022, for COVID-19 immunization; Bnt162b2 (DOSE 4 (BOOSTER), SINGLE, I had another, I think booster in about Aug2022.), administration date: Aug2022, for COVID-19 immunization; Bnt162b2 (DOSE 5 (BOOSTER), SINGLE, I had another booster, I think in about Nov2022 or Dec2022), administration date: 2022, for COVID-19 immunization.  The following information was reported: INCORRECT DOSE ADMINISTERED (non-serious) with onset Apr2023, outcome "unknown", described as "I had another booster, I think in about November or I had another booster, I think in about Nov2022 or Dec2022 and I had the last one just this past week, which was a booster shot I think"; APHASIA (non-serious), outcome "unknown", described as "my brain does not seem to be functioning right because all of the sudden I will be talking, and I won't be able to reach the word". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: It was reported by the patient that he have had only Pfizer shots for the COVID, he took the first one was probably in the fall of 2021. He had a booster he thought in about Mar2022 or Apr2022. He had another, he thought booster in about Aug2022. He had another booster, He thought in about Nov2022 or Dec2022 and he had the last one just this past week, which was a booster shot he thought, but it was the last COVID Vaccine that was on the market in the moment. The patient stated that he has progressively been unable to always reach the word that he want to use when he was taking. He was a retired person. She was Pfizer stock holder, at the hospital several weeks ago they did an MRI, he has no indication of any of the amyloids or anything associated with Alzheimer's, no indication of early Dementia. He was 80 years old, almost 81. When probed for the adverse event, consumer stated, sometime his brain does not seem to be functioning right because all of the sudden he will be talking, and he won't be able to reach the word he was college educated individual, he can't reach the word.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.