First Dose: sore arm/ Third dose/Booster: sore arm; Off label use; Extra dose administered; This is a spontaneous report from a contactable other hcp (patient). A 38-year-old male patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, solution for injection, Batch/Lot number was not reported) via an unspecified route of administration on an unspecified date (at the age of 37-year-old) at dose 1, single and received third dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, solution for injection, Batch/Lot number was not reported) via an unspecified route of administration, administered in arm right on 18Aug2021 (at the age of 37-year-old) at dose 3, single, both the doses for covid-19 immunisation. Medical history was reported as none. Concomitant medications were not reported. Patient previously received second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, solution for injection, Batch/Lot number was not reported) for COVID-19 Immunization. On an unspecified date the patient experienced first dose: sore arm/ third dose/booster: sore arm. Reporter calling about the Covid 19 vaccine. He received the Covid 19 vaccine and he received the third dose/booster dose. He states he has not had any flu like symptoms with any of the three Covid 19 vaccines. Reporter concerned that since he did not have any flu like symptoms he's not having an immune response. Clarified he has NOT had any flu like symptoms with any of the three Covid 19 vaccines. He didn't have any side effects other than some soreness in his arm but nothing he didn't expect from an injection. He is asking if there is any research or antibody information regarding not having an immune response. He reports he does work in the medical field as a physician's assistant. When probing for the dates/NDC/Lot/Expiry of the three Covid 19 vaccines he has received, he reports he does not have his Covid 19 vaccine card with him. Dates of the first 2 Covid 19 vaccines unknown. Third Covid 19 vaccine received yesterday, 18Aug2021. NDC/Lot/Expiry for all three doses unknown. He reports he had a sore arm with the first and the third Covid 19 vaccines. Description of complaint: He states he has not had any flu like symptoms with any of the Covid 19 vaccines. He's concerned that since he did not have any flu like symptoms he's not having an immune response. When probing for the dates/NDC/Lot/Expiry of the three Covid 19 vaccines he has received, he reports he does not have his Covid 19 vaccine card with him. Dates of the first 2 Covid 19 vaccines unknown. Third Covid 19 vaccine received yesterday, 18Aug2021. NDC/Lot/Expiry for all three doses unknown. Outcome of the events was unknown. Relatedness of drug to reaction(s)/event(s). Reaction assessed First Dose: sore arm, Source of assessment: Primary Source Reporter, Method of assessment: Global Introspection, Drug result: Related, Relatedness of drug to reaction(s)/event(s), Reaction assessed Third dose/Booster: sore arm, Source of assessment: Primary Source Reporter, Method of assessment: Global Introspection, Drug result: Related. Verbatim event relatedness: Covid 19 vaccine: First Dose: sore arm-Related, Covid 19 vaccine: Third dose/Booster: sore arm-Related.  The lot number for [BNT162B2], was not provided and will be requested during follow up.  Follow-up attempts are completed. No further information is expected.