delirium; hallucinations; Great confusion; Vaccine attacking brain; A  spontaneous report  was received from a consumer  concerning an 89-year old,  male patient who received Moderna's COVID-19 Vaccine (mRNA-1273) and  experienced, vaccine attacking brain, delirium, hallucinations, great confusion, had to go to rehab for 8 days to learn how to walk all over again, saying crazy stuff that doesn't make sense, sleep a lot, had severe dreams, very violent behavior and it was very out of character for him, vaccine affected the front lobes of brain, still reaching for things and eating things that are not there, very weak.  The patient's medical history, as provided by the reporter, included  Covid -19  She wants to disclose that her dad was one of the first people to receive the COVID-19 disease on 17March2020. He was hospitalized for 3 weeks because at that time no one knew about the disease and how to treat it. He was positive with COVID-19 for 84 days (16 nasal swabs were done). She kept him in  quarantine until 10June2020 in the basement as  per doctors advice and no known allergies were reported.  Lab data  include   Normal CT Scans. Concomitant medications reported included  gabapentin 400mg Three times a day Eliquis 2.5mg, pantoprazole 40mg, furosemide 40mg ,carvedilol 6.25mg Half a tablet every morning and every night, Tamsulosin 0.4mg, potassium 10mq, hydrocodone 5/325 every day, metformin 1000mg ,zinc 50mg, Vitamin D35000IU, Multivitamin, Vitamin C 1000mg, Magnesium 400, Probiotic.  On 06 Mar 2021, the patient received their second of two planned doses of mRNA-1273 (lot number  029A21A) intramuscularly for prophylaxis of COVID-19 infection.  She states that after the first dose on 6Feb2021, her father was admitted to the Hospital  for 8 days due to the vaccine attacking his brain. He had delirium, hallucinations, and constantly did not know where he was due to great confusion. After 8 days in the hospital, he had to go to rehab for 8 days to learn how to walk all over again. The hospital, after testing him over and over again, decided that the vaccine was the cause of his symptoms. His mental symptoms took 5 days to clear.  He took his second shot on 6 Mar 2021, and this time he  was admitted to the ICU due to his symptoms returning 10 fold from the first time he experienced it. Within 4 hours after he took the vaccine, he started saying crazy stuff that doesn't make sense, then slept a lot and had severe dreams and  hallucinations. She also mentions that her father had very violent behavior and it was very out of  character for him. She states that she believes the vaccine affected the frontal lobe of his brain,  even though both CT scans can through as clear. She discloses the Hospital will not do a MRI for her father since the two CT scans came back clear. She also mentions that he is still reaching for  things and eating things that are not there, she mentions he is very weak and her biggest worry is that this time, he won't come back to her mentally like he did the first time due to the severity of the symptoms. She believes that because he had the disease for so long, his body has built antibodies to it and he probably was not a good candidate to receive the vaccine.  Her main concern is that the hospital isn't doing anything for him, that the first time it took 5 days to clear his head, but she is scared that this time he won't come back to her.  No treatment information was provided.  Action taken with mRNA-1273 in response to the events was not reported.   The outcome of the events, vaccine attacking brain, delirium, hallucinations, great confusion, had to go to rehab for 8 days to learn how to walk all over again, saying crazy stuff that doesn't make sense, sleep a lot, had severe dreams, very violent behavior and it was very out of character for him, vaccine affected the front lobes of brain, still reaching for things and eating things that are not there, very weak. Were considered Unknown.; Reporter's Comments: Based on the information provided which includes a temporal association between the reported events, administration of mRNA-1273 vaccine and excluded all other etiologies, a causal association cannot be excluded. as patient had exacerbation of symptoms that developed at first vaccine dose after administration of second dose.