Temperature was really cold; Sore arm; Headache; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 57 year-old female patient (unknown if pregnant) received bnt162b2 (BNT162B2), administered in arm right, administration date 26Mar2021 (Lot number: ER8730) at the age of 57 years as 1st dose, single for covid-19 immunisation. Relevant medical history included: "Gastric bypass" (unspecified if ongoing), notes: Verbatim: Gastric bypass; "Has bacteria in her body that produces itself" (unspecified if ongoing), notes: Verbatim: Has bacteria in her body that produces itself; "Penicillin allergy" (unspecified if ongoing). Concomitant medication(s) included: VITAMIN A NOS; VITAMIN C ACID; ZINC; PROBIOTIC 10, start date: Jan2021, stop date: Jan2021; OMEPRAZOLE; TYLENOL; ASPIRIN ANALGESIC. The patient reported that both she and her husband took the first Pfizer Covid-19 shot on Friday 26Mar2021. She was tested for Covid-19 prior to getting vaccinated and the results were negative. On morning, 30Mar2021 she tested negative for Covid-19 but her husband tested positive. she and her husband were going back next day to get re-tested. She wants to verify the test results from this morning were not a false negative. They will be getting a rapid and mouth/oral Covid-19 tests. She reported that she is having surgery in less than 2 months so she needs to know if the vaccine can cause a positive COVID test result. she was 5' 8.5" but she thinks that she is shrinking. on 27Mar2021, her grandkids came over, and her husband was down at the beach with the grandchildren kids Sunday, 28Mar2021 and everything was peachy keen till 30Mar2021. she confirms she had a little bit of headache on Friday, 26Mar2021 and experienced a sore arm. She clarifies her arm was sore just that night of 26Mar2021. That next morning, she didn't feel anything else. If she pushes on her arm where the injection was given, she can feel a little something there, but its not like she can't lift her arm, or it hurts. She confirms there is nothing wrong with her arm. She had a slight headache after receiving the first dose, but she has a tendency to have headaches if she doesn't eat or stuff like that. So, she can't tell if the headache was from the vaccine or if it was just a regular/normal headache. She clarifies her headache began probably about 6:00 in afternoon on 26Mar2021. she reported that she took 2 Tylenol, and the headache went away. She gets headaches because she gets headaches. She used to have migraines, but she is fine. And she takes Tylenol anyway for her knees. She explains her husband said her temperature was very cold, her temperature was 65. She didn't feel cold or bad or anything, but when the thermometer was placed on her forehead it said 65. She was waiting to have surgery on her knees on 19May2021 if nothing goes wrong. She has to be a month infection free from the Covid-19 vaccine. She was supposed to have surgery last year on 14Apr2020 but was unable due to the Covid. she reported that because she is having surgery 13May2021 on her knee, her doctor wants her to have the Covid-19 vaccine. She mentions that her doctor forgot to tell her that she needed to be a month away from the last COVID shot, so she is only going to be 4 days away because she has to be clear. She has underlying issues and she takes antibiotics so she doesn't get infections, and the doctor wants to make sure that she is safe. Since she is already prone to infections, the doctor didn't want her to take a chance of getting COVID. She drinks (takes) a medication for pain of the legs. She is unable to walk and needs to replace both kneecaps but because of the COVID pandemic, it's just gotten worse and worse. Details were probed for her medications; however, she explains the medications were in another room and that it was difficult for her to get up as she did not have her cane and she was sitting on the sofa with her leg up. Blood pressure medication: she reported that the name of the medication was "Lopressor or something". She was unable to verify the name. she reported that she tests her blood pressure every day in the morning and afternoon. This is being done because her new doctor wants to see how it goes and they might switch it by the time her surgery comes around or add something to it. She reported that she started the antibiotics in the first week of Jan2021 as prophylaxis prior to her knee surgery. She mentions she has been on antibiotics, give or take, for the last 5 years. She has a bacterium in her body that just produces itself and because of that, they have been holding up on doing surgery because if the leg gets infected, they will have to remove the implant and wait 6 months and do another implant. However, she can't hold off anymore. Her left knee is bone on bone and her right knee she can't walk on because she has damaged it so much. She has to use a cane. She takes Omeprazole because she drinks so many other pills and had gastric bypass which makes her stomach very "blah" and she doesn't want to eat, so the Omeprazole has helped her a lot. She has been taking this daily since she started taking the antibiotic in the beginning of January. she reported that she had taken probiotics before but started taking them again 2 months ago in Jan2021 religiously. She reported that as soon as her physician put her on antibiotics, her son put her on probiotics. She confirms she also had a rapid Covid-19 test about a week before her first dose which was negative. on 31Mar2021, She was going for a rapid and a mouth swab Covid-19 test. The following information was reported: HEADACHE (non-serious) with onset 26Mar2021, outcome "recovered" (26Mar2021), described as "Headache"; PAIN IN EXTREMITY (non-serious) with onset 26Mar2021 18:00, outcome "recovered" (2021), described as "Sore arm"; BODY TEMPERATURE DECREASED (non-serious), outcome "unknown", described as "Temperature was really cold". Relevant laboratory tests and procedures are available in the appropriate section.  No follow-up attempts are possible. No further information is expected.