leukemia; It changed very much not only mental, not as toxic and stuff but had this now; This spontaneous case was reported by a consumer and describes the occurrence of LEUKAEMIA (leukemia) in a male patient of an unknown age who received mRNA-1273 BIVALENT (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) for COVID-19 prophylaxis. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.    On an unknown date, the patient received dose of mRNA-1273 BIVALENT (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) (unknown route) 1 dosage form. On an unknown date, the patient experienced LEUKAEMIA (leukemia) (seriousness criterion medically significant) and IMMUNISATION REACTION (It changed very much not only mental, not as toxic and stuff but had this now). At the time of the report, LEUKAEMIA (leukemia) and IMMUNISATION REACTION (It changed very much not only mental, not as toxic and stuff but had this now) outcome was unknown.            Concomitant product use was not provided by the reporter.   The reporter stated that, after the vaccination with the mRNA, it changed patient and parents very much. It was like not only mental, and they were not as toxic and stuff, but they had adverse event now. They took booster dose and that's when everything really took a nosedive. Reporter stated, it was really an urgent situation because the cutting-edge type of information that if it was caused by the vaccine, but the reporter thought it's leukemia because they were taking about chemo. Reporter further stated, it might not be a good idea to use chemo and it might be a better idea to use since they know. The genes were inserted and not, that someone could possibly fix the leukemia with a gene.  Company comment: This spontaneous case concerns a male patient of unknown age, with no medical history information reported, who experienced the unexpected serious (medically significant) event of leukemia and non serious adverse event of immunisation reaction (described as changed them very much, not only mental and they're not as toxic and stuff but they have this now). The events occurred on an unknown date after the booster dose of mRNA-1273 BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5) vaccine. As reported, everything really took a nosedive after taking booster and the reporter thought it's leukemia because they talked about chemo. No further information about the events or any diagnostic tests or findings was provided. The benefit-risk relationship of mRNA-1273 is not affected by this report.   This case was linked.; Sender's Comments: This spontaneous case concerns a male patient of unknown age, with no medical history information reported, who experienced the unexpected serious (medically significant) event of leukemia and non serious adverse event of immunisation reaction (described as changed them very much, not only mental and they're not as toxic and stuff but they have this now). The events occurred on an unknown date after the booster dose of mRNA-1273 BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5) vaccine. As reported, everything really took a nosedive after taking booster and the reporter thought it's leukemia because they talked about chemo. No further information about the events or any diagnostic tests or findings was provided. The benefit-risk relationship of mRNA-1273 is not affected by this report.