hallucination; This spontaneous case was reported by an other health care professional and describes the occurrence of HALLUCINATION (hallucination) in a  patient of an unknown age and gender who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination.     No Medical History information was reported.    On an unknown date, the patient received dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On an unknown date, the patient experienced HALLUCINATION (hallucination) (seriousness criterion medically significant). At the time of the report, HALLUCINATION (hallucination) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   No concomitant medications were reported.  Patient received Moderna COVID-19 Vaccine as 2nd booster dose. Reporter stated that in a virtual COVID office hour session which held on 06 Jun 2022, a healthcare provider who was attending the session asked if anyone was aware of reports of hallucination following a second Modern booster COVID vaccine. The attendee/HCP did not provide a name or location they represented. With guidance there was no mention of the age, gender, race, etc. of the patient that had reported the side effect following the 2nd booster of Moderna COVID vaccine. There was no additional information provided related to the duration/type/description of the hallucination reported.  No treatment information were provided.  Company comments: This is a spontaneous case concerning a patient of unknown age and gender, with no relevant medical history reported, who experienced the serious (medically significant), unexpected event of Hallucination which occurred on an unknown date after receiving the 2 booster dose of mRNA-1273 vaccine in the covid 19 vaccination series. Details of primary doses were not provided. The reporter did not provide the name, location, age, gender, race, etc. of the patient that had reported the side effect following the 2nd booster of Moderna COVID vaccine. There was no additional information provided related to the duration/type/description of the hallucination reported. No treatment medications were reported. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report. Event seriousness assessed per medical judgement.; Sender's Comments: This is a spontaneous case concerning a patient of unknown age and gender, with no relevant medical history reported, who experienced the serious (medically significant), unexpected event of Hallucination which occurred on an unknown date after receiving the 2 booster dose of mRNA-1273 vaccine in the covid 19 vaccination series. Details of primary doses were not provided. The reporter did not provide the name, location, age, gender, race, etc. of the patient that had reported the side effect following the 2nd booster of Moderna COVID vaccine. There was no additional information provided related to the duration/type/description of the hallucination reported. No treatment medications were reported. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report. Event seriousness assessed per medical judgement.