symptoms knocked her out, symptoms knocked her on her butt; bad taste; hard knot in arm; arm is hurting, arm is sore; muscles and joints are achy; headache; muscles and joints are achy; This spontaneous case was reported by a patient and describes the occurrence of LOSS OF CONSCIOUSNESS (symptoms knocked her out, symptoms knocked her on her butt) in a 70-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 059A22A) for COVID-19 prophylaxis. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.    On 09-Jun-2022, the patient received fourth dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On an unknown date, the patient experienced LOSS OF CONSCIOUSNESS (symptoms knocked her out, symptoms knocked her on her butt) (seriousness criterion medically significant), TASTE DISORDER (bad taste), LIMB MASS (hard knot in arm), PAIN IN EXTREMITY (arm is hurting, arm is sore), ARTHRALGIA (muscles and joints are achy), HEADACHE (headache) and MYALGIA (muscles and joints are achy). At the time of the report, LOSS OF CONSCIOUSNESS (symptoms knocked her out, symptoms knocked her on her butt), TASTE DISORDER (bad taste), LIMB MASS (hard knot in arm), PAIN IN EXTREMITY (arm is hurting, arm is sore), ARTHRALGIA (muscles and joints are achy), HEADACHE (headache) and MYALGIA (muscles and joints are achy) outcome was unknown.            No concomitant drug was reported.  It was reported that patient did not experience side effects from the other doses.   It was reported that patient experienced side effects from the 2nd booster dose of the Moderna COVID-19 vaccine on 09Jun2022.  Patient talked to several people who some reported side effects and some did not.   No Treatment medications were reported. Company comment This spontaneous case reported by a patient concerns a 70-year-old female patient with no medical history reported, who experienced the unexpected serious event of loss of consciousness and other non-serious events, which occurred on an unknown date after receiving the fourth dose of mRNA-1273, thus latency between vaccination and the event cannot be assessed. The patient reports that after the 2nd booster dose, the symptoms knocked her out. She reports her arm was sore, hard knot, when she tried to move her arm the muscles and joints were achy. She also had headache and bad taste. She did not experience side effects from the other doses. The benefit-risk relationship of mRNA-1273 Vaccine is not affected by this report.; Sender's Comments: This spontaneous case reported by a patient concerns a 70-year-old female patient with no medical history reported, who experienced the unexpected serious event of loss of consciousness and other non-serious events, which occurred on an unknown date after receiving the fourth dose of mRNA-1273, thus latency between vaccination and the event cannot be assessed. The patient reports that after the 2nd booster dose, the symptoms knocked her out. She reports her arm was sore, hard knot, when she tried to move her arm the muscles and joints were achy. She also had headache and bad taste. She did not experience side effects from the other doses. The benefit-risk relationship of mRNA-1273 Vaccine is not affected by this report.