COVID-19; Serious pain at the injection site from the time of vaccination; Long-lasting bad reaction to vaccine/Pt not had a pleasant experience; I did not receive second dose since i was hospitalized with covid soon after receiving the vaccine; This spontaneous case was reported by a patient and describes the occurrence of COVID-19 (COVID-19) in a  patient of an unknown age and gender who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.    In April 2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. In April 2021, the patient experienced VACCINATION SITE PAIN (Serious pain at the injection site from the time of vaccination). In 2021, the patient experienced COVID-19 (COVID-19) (seriousness criterion hospitalization), VACCINATION COMPLICATION (Long-lasting bad reaction to vaccine/Pt not had a pleasant experience) and PRODUCT DOSE OMISSION ISSUE (I did not receive second dose since i was hospitalized with covid soon after receiving the vaccine). At the time of the report, COVID-19 (COVID-19) and PRODUCT DOSE OMISSION ISSUE (I did not receive second dose since i was hospitalized with covid soon after receiving the vaccine) outcome was unknown and VACCINATION COMPLICATION (Long-lasting bad reaction to vaccine/Pt not had a pleasant experience) and VACCINATION SITE PAIN (Serious pain at the injection site from the time of vaccination) had not resolved.        The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.       Patient did not receive second dose since patient was hospitalized with Covid soon after receiving vaccine. Concomitant medication was not provided. Treatment information was not reported.  This is a spontaneous case concerning a patient of unknown age and gender with no medical history reported, who experienced the unexpected events of vaccination site pain, COVID-19, vaccination site complication and product dose omission issue. Vaccination site pain and the received first dose of mRNA  1273 vaccine were both experienced on April 2021. The other events occurred on an unspecified date. COVID-19 was reported to cause hospitalization and at the time of report outcome of COVID-19 was still unknown while vaccination site pain and vaccination complication have not resolved. Patient did not receive second dose since patient was hospitalized with Covid soon after receiving vaccine. The reporter's assessment was not provided. The benefit-risk relationship of the vaccine is not affected by this report.; Sender's Comments: This is a spontaneous case concerning a patient of unknown age and gender with no medical history reported, who experienced the unexpected events of vaccination site pain, COVID-19, vaccination site complication and product dose omission issue. Vaccination site pain and the received first dose of mRNA  1273 vaccine were both experienced on April 2021. The other events occurred on an unspecified date. COVID-19 was reported to cause hospitalization and at the time of report outcome of COVID-19 was still unknown while vaccination site pain and vaccination complication have not resolved. Patient did not receive second dose since patient was hospitalized with Covid soon after receiving vaccine. The reporter's assessment was not provided. The benefit-risk relationship of the vaccine is not affected by this report.