Slight slurred speech; Left leg, weird sensation; Left leg, no strength\weakness in left side of body including left leg\anytime he uses his arms muscles gets weak quickly; symptoms are getting worse and states it is whole left side; difficulty walking long distance; weakness in left side of body including left leg; Swelling in front, left shoulder; soreness and pain at the injection site; Fatigue; Flu like symptoms; Left arm seizing up; left arm unable to lift up; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of DYSARTHRIA (Slight slurred speech), MOBILITY DECREASED (Left arm seizing up; left arm unable to lift up), SENSORY DISTURBANCE (Left leg, weird sensation), MUSCULAR WEAKNESS (Left leg, no strength\weakness in left side of body including left leg\anytime he uses his arms muscles gets weak quickly) and INFLUENZA LIKE ILLNESS (Flu like symptoms) in a 50-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 011L20A and 032L20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical history was reported by reporter.  Concomitant products included MULTIVITAMIN [VITAMINS NOS] and VITAMIN D NOS for an unknown indication.   On 15-Jan-2021 at 6:00 PM, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 12-Feb-2021 at 6:00 PM, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 17-Jan-2021, the patient experienced MOBILITY DECREASED (Left arm seizing up; left arm unable to lift up), INFLUENZA LIKE ILLNESS (Flu like symptoms) and FATIGUE (Fatigue). On an unknown date, the patient experienced DYSARTHRIA (Slight slurred speech), SENSORY DISTURBANCE (Left leg, weird sensation), MUSCULAR WEAKNESS (Left leg, no strength\weakness in left side of body including left leg\anytime he uses his arms muscles gets weak quickly), CONDITION AGGRAVATED (symptoms are getting worse and states it is whole left side), GAIT DISTURBANCE (difficulty walking long distance), ASTHENIA (weakness in left side of body including left leg), SWELLING (Swelling in front, left shoulder) and VACCINATION SITE PAIN (soreness and pain at the injection site). The patient was treated with Physical therapy for Dysarthria; Physical therapy for Mobility decreased; Physical therapy for Sensory disturbance and Physical therapy for Muscular weakness. At the time of the report, DYSARTHRIA (Slight slurred speech), MOBILITY DECREASED (Left arm seizing up; left arm unable to lift up), SENSORY DISTURBANCE (Left leg, weird sensation), MUSCULAR WEAKNESS (Left leg, no strength\weakness in left side of body including left leg\anytime he uses his arms muscles gets weak quickly), CONDITION AGGRAVATED (symptoms are getting worse and states it is whole left side), GAIT DISTURBANCE (difficulty walking long distance), ASTHENIA (weakness in left side of body including left leg), SWELLING (Swelling in front, left shoulder) and VACCINATION SITE PAIN (soreness and pain at the injection site) had not resolved and INFLUENZA LIKE ILLNESS (Flu like symptoms) and FATIGUE (Fatigue) outcome was unknown.            12-Feb-2021 Patient did receive the second dose and did not report new symptoms following the second dose.   Most recent FOLLOW-UP information incorporated above includes: On 17-May-2021: Follow-up information received on 17-may-2021 contains significant information.  Updated lot number and route of administration of vaccine for 2 doses.  Updated muscular weakness event, outcome of the events to not recovered or resolved.  Added events condition aggravated, gait disturbance, asthenia, vaccination site pain.