bilateral pulmonary embolism; multiple areas of infarct; back pain; ateltheisis; chest pain; left leg pain; deep vein thrombosis; pulmonary effusions; fever; Chills; myalgia; A spontaneous report was received from a physician who was also a 55-year-old, previously healthy male patient who received Moderna's COVID-19 vaccine (mRNA-1273) and experienced fever/pyrexia, chills, myalgia, chest and back pains, bilateral pulmonary embolism/pulmonary embolism, multiple areas of infarct/pulmonary infarct, ateltheisis/atelectasis, left leg pain, and deep vein thrombosis.  The patient's medical history included daily exercise and no personal or family history of clotting issues and no trauma. Products known to have been used by the patient were not provided.  On 02 Jan 2021, prior to the onset of the events, the patient received the first of two planned doses of mRNA-1273 (Lot number: 039k20-2a) intramuscularly for prophylaxis of COVID-19 infection.    On 30 Jan 2021, approximately 28 days after the first dose, and prior to the onset of symptoms, the patient received the second of two planned doses of mRNA-1273 (Lot number: 012m20a) intramuscularly for the prophylaxis of COVID-19 infection.   On 30 Jan 2021, the patient reports that for the first 18 hours, he experienced fever, chills and myalgia.   On 01 Feb 2021, the patient reports that he thought the myalgia was continuing, as he had pain in his chest and back. The chest pains gradually worsened.  On 05 Feb 20221, the patient went to the emergency room and was admitted.  He was diagnosed with a pulmonary embolism. He was started on enoxaparin sodium but switched to apixaban. A computerized tomography study of the lungs showed that he had bilateral pulmonary embolism, multiple areas of infarct and atelectasis. His dimer was 4800. COVID-19 test was negative.  An echocardiograph was performed, no results were reported. An ultrasound of the legs was performed and ruled out deep vein thrombosis. Date of discharge was not specified.  On an unknown date two days after discharge, the patient experienced left leg pain and returned to the emergency department. Patient was diagnosed with deep vein thrombosis that ran the entire length of the femoral artery. Patient was switched back to enoxaparin sodium and taken off the apixaban. A repeat computerized tomography study was done to see if the pulmonary embolism was progressing and it was not, however, it showed pulmonary effusions. All current lab work was reported as normal, except for an increased prothrombin time. COVID-19 test was negative.  Patient continues to be followed by a pulmonologist and hematologist.  Consent to contact patient, pulmonologist and hematologist was obtained.  Action taken with mRNA-1273 was not applicable.  The outcome of the events, fever/pyrexia, chills, myalgia, chest and back pains, bilateral pulmonary embolism/pulmonary embolism, multiple areas of infarct/pulmonary infarct, ateltheisis/atelectasis, left leg pain, and deep vein thrombosis, was considered not resolved.; Reporter's Comments: Very limited information regarding this events has been provided at this time.  Further information has been requested. Company assessed the events to be unlikely related to company product.