Epileptic seizure; Twitching of the legs/Twitching of the arms/Her body would not stop twitching; Muscle spasm; Fever at 104 degrees Fahrenheit; This spontaneous case was reported by a consumer and describes the occurrence of EPILEPSY (Epileptic seizure), MUSCLE TWITCHING (Twitching of the legs/Twitching of the arms/Her body would not stop twitching), MUSCLE SPASMS (Muscle spasm) and PYREXIA (Fever at 104 degrees Fahrenheit) in a 20-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 008C21A and 008C21A) for COVID-19 vaccination.     No medical history was reported.    On 16-Apr-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On an unknown date, the patient received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 14-May-2021, the patient experienced EPILEPSY (Epileptic seizure) (seriousness criterion medically significant), MUSCLE TWITCHING (Twitching of the legs/Twitching of the arms/Her body would not stop twitching) (seriousness criterion medically significant), MUSCLE SPASMS (Muscle spasm) (seriousness criterion medically significant) and PYREXIA (Fever at 104 degrees Fahrenheit) (seriousness criterion medically significant). At the time of the report, EPILEPSY (Epileptic seizure), MUSCLE TWITCHING (Twitching of the legs/Twitching of the arms/Her body would not stop twitching), MUSCLE SPASMS (Muscle spasm) and PYREXIA (Fever at 104 degrees Fahrenheit) outcome was unknown.            Patient received her second dose of the Moderna COVID-19 vaccine yesterday on 14MAY2021 at 10:30  AM. Patient experienced epileptic seizure, twitching of the arms, twitching of the legs, muscle spasm, and fever at 104 degrees Fahrenheit after receiving the second dose of the vaccine. She was sent to hospital twice yesterday. She came home last night from the hospital, went to sleep, and then she woke up around 4am screaming for his wife. Her body would not stop twitching and she kept punching herself with her arm. She went to the hospital again so they can calm her symptoms down. The emergency room doctors prescribed her medications for her shakiness and twitchiness. Her symptoms have been going on for 28 hours. The caller mentioned that the emergency room doctors did not know what to do with patient but to prescribe her medications to treat her symptoms. Patient was a healthy young girl until she got the second dose of the vaccine. Patient received the first dose of the Moderna COVID-19 vaccine on 16APR2021 and she experienced only experienced arm soreness for a couple days.  No treatment information provided. No concomitant medication provided.  Action taken with mRNA-1273 in response to the events was not applicable.  Company comment: Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.   This case was linked to MOD-2021-132361 (Patient Link).; Sender's Comments: Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.