he is still having chills; fever; very hard for him to sleep; Sweating; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 83 year-old male patient received bnt162b2 (BNT162B2), administered in arm left, administration date 13Feb2021 (Batch/Lot number: unknown) at the age of 82 years as dose 2, single for covid-19 immunisation. The patient's relevant medical history was not reported. There were no concomitant medications. Vaccination history included: Bnt162b2 (dose 1, single, lot/batch number: EL9262, expiry dates unknown, anatomical location: right arm, route: unknown), administration date: Jan2021, for COVID-19 Immunization, reaction(s): "little soreness at the injection site".  The following information was reported: CHILLS (non-serious) with onset 2021, outcome "not recovered", described as "he is still having chills"; PYREXIA (non-serious) with onset 2021, outcome "not recovered", described as "fever"; INSOMNIA (non-serious) with onset 2021, outcome "not recovered", described as "very hard for him to sleep"; HYPERHIDROSIS (non-serious) with onset 2021, outcome "not recovered", described as "Sweating".  Additional information: It was reported that for a few months the patient was still having chills and fever (ranging from 98F-99.7F). He added that he was experiencing this every night and it was very hard for him to sleep because of that. The patient also stated that the patient was ready to get his booster dose but he was quite afraid that it will make the adverse event worse. He was wondering if it was contraindicated for him to get the booster dose considering his state. It was reported that the reactogenicity profile within seven days after the booster (third) dose was typically mild to moderate. The most common events included injection site pain, fatigue, headache, muscle and joint pain, and chills. The frequency of any severe systemic event after the booster dose was low. The frequency of reactogenicity was similar to or better than after dose two of the primary series. The adverse event profile was generally consistent with other clinical data for COMIRNATY. It was told to patient that do not administer Pfizer-BioNTech COVID-19 Vaccine to individuals with known history of a severe allergic reaction (e.g., anaphylaxis) to any component of the Pfizer-BioNTech COVID-19 Vaccine. It was reported that the patient was referred to HCP for further guidance as Pfizer was not able to give individual recommendations to patient receiving the vaccine. It was reported that caller was a consumer that was calling about the Pfizer Covid-19 Vaccine and was calling about a reaction. The caller reported that he took his second dose 13Feb2021. With the first dose he had a little soreness at the injection site. He said that he received the second dose and everything was fine until a couple of months ago and he started having chills and fever. The chills kind of had a tickling throughout his body. He was having a fever at night and can hardly sleep. The heat comes from the inside of his body and comes up. He said that he was sweating with the fever and the sweating is like a mist that is coming out of his skin. He was changing his t shirts 2-3 times a night. If he doesn't wear a t shirt, he is soaking the bed from sweating. He will feel the heat coming throughout his body that starts from the inside and rises up and he has like a misty sweating and his skin gets damp and misty all over. He said that he experiences this in his upper body. If he lays in one spot he will have to raise up because he gets too hot, and it was hard to sleep with things going on like that. He said that his symptoms started about 2 months ago. Caller does not know his email address. No contact details for the HCP at the time of the call. Caller said that some nights it was real bad and other nights it was not as bad. He said that he has to eat popsicles and crushed ice to cool down and it helps for a couple of hours then the spot he was laying in gets hot again and he starts sweating. He was ready to get his booster, but will it make this worse. The reporter queried is it safe to take it. He said that it was a common thing that he found online with people that have had the vaccine. No further details provided. Reportedly emergency room visit and physician office visit is not require.   No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.