In the hospital with a 99.7 degree fever; Blood disorder which is a pre cursor to leukemmia; This spontaneous case was reported by a patient family member or friend and describes the occurrence of PYREXIA (In the hospital with a 99.7 degree fever) and LEUKAEMIA (Blood disorder which is a pre cursor to leukemmia) in an adult female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 prophylaxis.     No Medical History information was reported.    In March 2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On an unknown date, the patient experienced PYREXIA (In the hospital with a 99.7 degree fever) (seriousness criterion hospitalization) and LEUKAEMIA (Blood disorder which is a pre cursor to leukemmia) (seriousness criterion medically significant). At the time of the report, PYREXIA (In the hospital with a 99.7 degree fever) and LEUKAEMIA (Blood disorder which is a pre cursor to leukemmia) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Body temperature: 99.7 degree fever.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.       The concomitant medication was not reported by reporter. The reporter was rambling and said that his Mom was in the hospital with a 99.7 degree fever and might had a blood disorder which was a pre cursor to leukemmia caused by receiving the Moderna Covid-19 vaccine. The caller thought that the Moderna Covid-19 vaccine had stolen his mother's genes. The reporter stated that Moderna give his Mother her genes back. It was reported that the Moderna Covid-19 vaccine caused his Mother to discuss previous illicit drug use when patient was in younger days years ago.  The reporter was jumping from topic to topic. The cancer, world was dense, vaccines were experimental.  The treatment medication was not reported by reporter.  Company Comment: This spontaneous case concerns an adult female patient (age not specified), with no medical history reported, who experienced unexpected serious (hospitalization) event of Pyrexia and unexpected serious (medically Significant) event of Leukaemia (reported as Blood disorder which is a pre cursor to leukaemia) which occurred on an unknown date after receiving first dose of mRNA-1273 vaccine. Body temperature reported as 99.7-degree. No further information on clinical course, investigations and treatment received was available in the report. outcome of the events was not known at the time of report. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.; Sender's Comments: This spontaneous case concerns an adult female patient (age not specified), with no medical history reported, who experienced unexpected serious (hospitalization) event of Pyrexia and unexpected serious (medically Significant) event of Leukaemia (reported as Blood disorder which is a pre cursor to leukaemia) which occurred on an unknown date after receiving first dose of mRNA-1273 vaccine. Body temperature reported as 99.7-degree. No further information on clinical course, investigations and treatment received was available in the report. outcome of the events was not known at the time of report. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.