Fatigue; Achy; Booster vaccine; Her nail beds and turning a lavender/blue/grey color/finger nails turned grayish blue colour; Fever/low grade fever; Hot flashes; Sweating a lot; Slept most of the day/She had to take naps for several days; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP and Physician) from medical information team. The reporter is the patient.  A 78 year-old female patient received bnt162b2 (BNT162B2), intramuscular, administered in arm left, administration date 01Oct2021 (Lot number: 30155BA) at the age of 78 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Glucose intolerance" (ongoing); "Hyperlipidemia" (ongoing); "Hypothyroid" (ongoing); "Acid reflux" (ongoing). Concomitant medication(s) included: BIOTIN; CHOLECALCIFEROL; GINGER [ZINGIBER OFFICINALE]; LEVOTHYROXINE; METFORMIN; CALCIUM; VITAMIN D [VITAMIN D NOS]. Vaccination history included: Bnt162b2 (First dose-18Jan2021, given in the morning, in the left arm, Lot-EL0142., Anatomical site of injection: L deltoid, Intramuscular), administration date: 18Jan2021, when the patient was 77 years old, for Covid-19 Immunization, reaction(s): "Tenderness"; Bnt162b2 (Second dose- 05Feb2021, given in the morning, in the left arm, Lot-EL9264., After the second dose, her fever spiked 5 degrees., Anatomical site of injection: L deltoid, Intramuscular), administration date: 05Feb2021, when the patient was 77 years old, for Covid-19 Immunization, reaction(s): "Fever", "Chills", "Achiness", "Headache", "Tenderness". The following information was reported: IMMUNISATION (non-serious) with onset 01Oct2021, outcome "unknown", described as "Booster vaccine"; NAIL DISCOLOURATION (non-serious) with onset Oct2021, outcome "not recovered", described as "Her nail beds and turning a lavender/blue/grey color/finger nails turned grayish blue colour"; PYREXIA (non-serious) with onset Oct2021, outcome "recovered" (Oct2021), described as "Fever/low grade fever"; FATIGUE (non-serious) with onset 02Oct2021, outcome "recovered" (Oct2021), described as "Fatigue"; PAIN (non-serious) with onset 02Oct2021, outcome "recovered" (Oct2021), described as "Achy"; HOT FLUSH (non-serious) with onset Oct2021, outcome "unknown", described as "Hot flashes"; HYPERHIDROSIS (non-serious) with onset Oct2021, outcome "unknown", described as "Sweating a lot"; HYPERSOMNIA (non-serious) with onset Oct2021, outcome "recovered" (Oct2021), described as "Slept most of the day/She had to take naps for several days". Relevant laboratory tests and procedures are available in the appropriate section included Body temperature: 97.0; Her fever Spiked by 4 points next morning. Her baseline was 97.0 on 02Oct2021. On an unspecified day in Oct2021, patient had a very strong fever for 1 day, then it was up 2 degrees for the next 2 days and O2 levels: 100%; Her oxygen levels were perfect. The patient reported that she received the 2 dose series of the Pfizer Covid-19 vaccine and then received the booster dose. Following the booster, her oxygen levels were perfect, but her nail beds and turning a lavender/blue/grey color and when she lays down at night, her pillow case was turning blue. The patient got her booster on 01Oct2021. Her fever spiked by 4 points next morning. She did not have chills the night of the shot like with the second shot. Patient reported she was achy and fatigued which started the next day, 02Oct2021. She slept most of the day. The patient explained she had to take naps for several days; this had resolved. The reason for her call was that her finger nails had turned mauve, a lavender bluish color. She explained that she has had hot flashes for awhile now and was used to sweating a lot. She now had noticed a stained blue pillowcase, this was noticed Sunday. The patient remarks she was out on Saturday. It was noted that on Sunday she was reading the newspaper and thought it was new print from the paper. When she went to wash her hands she noticed her fingernails were the same. She wants information about this. Fever- Her baseline is 97.0. She had a very strong fever for 1 day, then it was up 2 degrees for the next 2 days, then resolved. The discolored fingernails got very intense yesterday, 06Oct2021 which was why she finally decided to call. She had checked her o2 and it was at 100%, as she know this can be a result of low O2. She had reported this to her internist and she was aware. Nothing in her life had changed, medication, foods, nothing. She did have tenderness after the first injection, more than after the second or the booster. History of all previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available): None. No additional vaccines administered on same date of the Pfizer Suspect. Prior Vaccinations (within 4 weeks): none. AE(s) following prior vaccinations: None.  No follow-up attempts are possible. No further information is expected.