Hearing loss in right ear; Vertigo; Dizziness; Tinnitus; This literature-study case was reported in a literature article and describes the occurrence of DEAFNESS UNILATERAL (Hearing loss in right ear) in a 43-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.   LITERATURE REFERENCE: Otologic manifestations after COVID-19 vaccination: Ear clinic experience. 2021;42(9):e1213-8.    Concurrent medical conditions included Meniere's disease (Duration of Meniere's disease is more than 5 years. Prior Oto History it was stable).    On an unknown date, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On an unknown date, the patient experienced DEAFNESS UNILATERAL (Hearing loss in right ear) (seriousness criterion medically significant), VERTIGO (Vertigo), DIZZINESS (Dizziness) and TINNITUS (Tinnitus). At the time of the report, DEAFNESS UNILATERAL (Hearing loss in right ear), VERTIGO (Vertigo), DIZZINESS (Dizziness) and TINNITUS (Tinnitus) outcome was unknown. Possible      The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.   For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter considered DEAFNESS UNILATERAL (Hearing loss in right ear), VERTIGO (Vertigo), DIZZINESS (Dizziness) and TINNITUS (Tinnitus) to be possibly related.    No relevant concomitant medications were reported.  Most of the patients are still undergoing treatment, which may include oral, IT steroids, and/or antivirals. In all cases magnetic resonance imaging of the internal auditory canals was also ordered. Patients pre-treatment audiograms, with the PTA and WRS recorded. Extent hearing recovery and symptoms recovering is currently unknown.  This case concerns a 43 year-old, male with a history of Meniere´s Disease, who experienced the unexpected events of DEAFNESS UNILATERAL (besides other Non serious events) . The event occurred approximately 14 days after the first dose of mRNA-1273 Moderna vaccine.  The event was considered related to the product per the reporter´s assessment. The rechallenge is unknown (information regarding 2nd dose was not provided)  Meniere´s Disease could be a potentially confounder for the events. The benefit-risk relationship of mRNA-1273 Moderna vaccine in not affected by this report.   This case was linked to MOD-2021-337903, MOD-2021-337994, MOD-2021-337995, MOD-2021-337996, MOD-2021-337997, MOD-2021-337998, MOD-2021-337999, MOD-2021-338001, MOD-2021-338002, MOD-2021-338003, MOD-2021-338004, MOD-2021-338005, MOD-2021-338006, MOD-2021-338007, MOD-2021-338008, MOD-2021-338009, MOD-2021-338010 (Patient Link).; Sender's Comments: This case concerns a 43 year-old, male with a history of Meniere´s Disease, who experienced the unexpected events of DEAFNESS UNILATERAL (besides other Non serious events) . The event occurred approximately 14 days after the first dose of mRNA-1273 Moderna vaccine.  The event was considered related to the product per the reporter´s assessment. The rechallenge is unknown (information regarding 2nd dose was not provided)  Meniere´s Disease could be a potentially counfounder for the events. The benefit-risk relationship of mRNA-1273 Moderna vaccine in not affected by this report.