REALLY DIZZY; OTHER SYMPTOMS (SOME WEIRD SYMPTOMS); REVACCINATION WITH DIFFERENT COVID-19 VACCINE; This spontaneous report received from a patient via a company representative via social media concerned a patient of unspecified age, sex, race and ethnic origin. The patient's weight, height, and medical history were not reported. The patient previously received non-company suspect vaccine included Pfizer Biontech (tozinameran) (Dose number in series 1) (form of admin, route of admin, batch number and expiry was not reported) dose, start therapy date was not reported for covid-19 prophylaxis. On an unspecified date, the patient experienced mild symptoms (Dose number in series 1). The patient previously received non-company suspect vaccine included Pfizer Biontech (tozinameran) (Dose number in series 2) (form of admin, route of admin, batch number and expiry was not reported) dose, start therapy date was not reported for covid-19 prophylaxis. It was unknown whether patient had any adverse events following vaccination with Pfizer Biontech (tozinameran) (Dose number in series 2). The patient received covid-19 vaccine ad26.cov2.s (Dose number in series 3) (suspension for injection, route of admin, batch number and expiry were not reported) dose was not reported, 01 total administered, start therapy date were not reported for covid-19 prophylaxis. It was unknown whether patient had any adverse events following vaccination with covid-19 vaccine ad26.cov2.s (Dose number in series 3). The patient received covid-19 vaccine ad26.cov2.s (Dose number in series 4) (suspension for injection, route of admin, batch number and expiry were not reported) dose was not reported, 01 total administered, start therapy date were not reported for covid-19 prophylaxis which was associated with revaccination with different covid-19 vaccine (Dose number in series 4). The batch number was not reported. Per procedure, no follow-up will be requested for this case. No concomitant medications were reported.  On an unspecified date, the patient experienced other symptoms (some weird symptoms) and felt really dizzy. (Dose number in series 4). On an unspecified dates, the patient had undergone covid-19 test eight times but results were negative all the time. Reporter stated that, "had some weird symptoms too, after my first and fourth covid shots. I wasn't going to get it, but I'd gone to see my doctor , he asked me if I wanted a flu shot too. I'm still experiencing symptoms, even though it was at least a couple of months or more ago. I don't know which one my doctors office gave me that day, but I'd had the Pfizer ones throughout the rest of the others . I'd had done. I had really mild symptoms with the first shot I got and then this Second booster. I felt really dizzy , and had other symptoms . All of the covid tests I've had done because of procedures, were negative and I've had at least eight of the covid tests. Only two of them , because I didn't feel so good. But they all came back negative. My doctor no longer asks me , so I'm assuming he's satisfied that I'm protected from getting covid." The action taken with covid-19 vaccine ad26.cov2.s was not applicable. The patient had not recovered from really dizzy, and other symptoms (some weird symptoms), and the outcome of revaccination with different covid-19 vaccine was not reported. This report was non-serious.