moderna arm; couldn't walk up stairs; COVID-19; the same muscle aches & pains; had chills; This spontaneous case was reported by a physician and describes the occurrence of VACCINATION COMPLICATION (moderna arm), GAIT INABILITY (couldn't walk up stairs), COVID-19 (COVID-19), MYALGIA (the same muscle aches & pains) and CHILLS (had chills) in a 39-year-old male patient 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 second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On an unknown date, the patient experienced VACCINATION COMPLICATION (moderna arm), GAIT INABILITY (couldn't walk up stairs), COVID-19 (COVID-19), MYALGIA (the same muscle aches & pains) and CHILLS (had chills). At the time of the report, VACCINATION COMPLICATION (moderna arm) had not resolved and GAIT INABILITY (couldn't walk up stairs), COVID-19 (COVID-19), MYALGIA (the same muscle aches & pains) and CHILLS (had chills) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, SARS-CoV-2 test negative: positive positive.     For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   No concomitant and treatment medications were reported. The patient did not have his vaccination card with him in February of 2021.Patient wanted to suggest that Moderna look to see if there is any correlation between a flare up of Moderna arm and being positive for Covid since that happened to him. The patient did not have any reactions to the 1st dose.  Company comment:  This regulatory authority case concerns a 39-year-old male patient with no medical history reported, who experienced non-serious unexpected AESI of COVID-19, that occurred day after the 2nd dose of the mRNA-1273 however, the exact time to onset was not provided . Reportedly, the patient experienced the ''Moderna arm'' after 2nd dose with vaccination site warmth, swelling, redness, as well as pains and aches. The patient was also unable to walk up stairs and was knocked out for 24 hours. Unspecified time later, the patient had chills, pains and aches again, as well as flare up of the Moderna arm however, the patient was also tested positive for COVID.  The rechallenge was not applicable due to occurrence after the 2nd dose and nature of the event. The benefit-risk relationship of mRNA-1273 is not affected by this report.; Sender's Comments: This regulatory authority case concerns a 39-year-old male patient with no medical history reported, who experienced non-serious unexpected AESI of COVID-19, that occurred day after the 2nd dose of the mRNA-1273 however, the exact time to onset was not provided . Reportedly, the patient experienced the ''Moderna arm'' after 2nd dose with vaccination site warmth, swelling, redness, as well as pains and aches. The patient was also unable to walk up stairs and was knocked out for 24 hours. Unspecified time later, the patient had chills, pains and aches again, as well as flare up of the Moderna arm however, the patient was also tested positive for COVID.  The rechallenge was not applicable due to occurrence after the 2nd dose and nature of the event. The benefit-risk relationship of mRNA-1273 is not affected by this report.