shortness of breath; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 77-year-old male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 26Nov2022 as dose 5 (booster), single (Lot number: GJ6739) at the age of 76 years, in left arm for covid-19 immunisation. The patient's relevant medical history was not reported. The patient took concomitant medications. Vaccination history included: BNT162b2 (First Dose: , LOT: Unknown, there is no number listed on card, NDC, EXP: Unknown), administration date: 09Mar2021, when the patient was 75-year-old, for COVID-19 Immunization; BNT162b2 (Second Dose: , LOT: EP6955, NDC, EXP: Unknown), administration date: 01Apr2021, when the patient was 75-year-old, for COVID-19 Immunization; BNT162b2 (Third Dose: , LOT: thinks it is FC75327, NDC, EXP: Unknown), administration date: 10Nov2021, when the patient was 75-year-old, for COVID-19 Immunization; BNT162b2 (Fourth Dose: , LOT: FM9992, NDC, EXP: Unknown), administration date: 21Apr2022, when the patient was 76-year-old, for COVID-19 Immunization; Flu shot (Prior Vaccinations (within 4 weeks): Flu shot just before about 3 weeks before., Vaccine Name: Unknown, Manufacturer: Unknown , Lot Number/ Expiry Date: Unknown), for Immunization. The following information was reported: DYSPNOEA EXERTIONAL (non-serious) with onset Dec2022, outcome "not recovered", described as "shortness of breath". Additional information: As per agent and confirmed by caller, caller experienced shortness of breath after receiving his last Pfizer covid 19 booster; he is wanting to know if it will continue or will it go away. Upon request for details: caller received last vaccine shot on 26Nov2022. States about 1-1.5 weeks ago and 2 weeks after receiving the shot he noticed shortness of breath. Stated he only notices it when he walks. States he usually walks about 4 days a week and is able to walk about 6 times around a track and had no problems. Stated he is barely able to walk 6 times around the track and today was only able to walk 2 1/2 times around the track which is a big change for him. Stated he has a hcp appt next week. BNT162B2, BNT162B2 OMI BA.4-5 administered on 26Nov2022 with lot number: GJ6739 (Booster, fifth dose; left upper arm), Indication as got to take the booster, like everybody else. Shortness of breath was reported as worsened. Call regarding Covid-19 vaccine. Took 2 regular shots and the booster. Took last booster 26Nov2022, noticed about 2 weeks after took it, is now getting shortness of breath. When he got the shot, it started about 2 weeks after got it , was in Dec2022. Shortness of breath: Started around 2 weeks after 26Nov2022, when got the shot, was the second week and a half in Dec2022. Outcome: It started off a little lighter than it what it is now. Goes walking 4 days a week, for 30 minutes and has gotten a little worse. Usually, goes on a track 6 times before this. Now, gets to the first round and is ready to quit because of the shortness of breath. No Treatment. Clarified that caller had 3 boosters and 2 regular doses, for a total of five doses of the Covid-19 vaccine and, they were all Pfizer. Gets all that from the doctor and he has all of his medications on file. Test results: Got a nuclear stress test done just before getting the booster. No Family Medical History Relevant to Adverse Events (AEs). Just going to start walking for a while. If he can get through, can see if it will go away or not. If not, he would be in trouble. Other Conditions and Investigations: Unknown  No follow-up attempts are needed. No further information is expected.