low grade fever but went up to 100.6 degrees; Chills; Couldn't walk, loss of balance; Headache; Neck pain; Tremors; More severe reactions; Stabbing pain like a knife throughout her body / Achy all over/Pain; Couldn't walk, loss of balance; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A female patient received BNT162b2 (BNT162B2), as dose 3 (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Bnt162b2 (Dose 1, she also had these reactions with the previous Pfizer Covid vaccines), for COVID-19 Immunization, reaction(s): "pain/Stabbing pain like a knife throughout her body/Achy all over", "low grade fever but went up to 100.6 degrees"; Bnt162b2 (Dose 1, she also had these reactions with the previous Pfizer Covid vaccines), for Covid-19 immunization, reaction(s): "Chills"; Bnt162b2 (Dose 1, she also had these reactions with the previous Pfizer Covid vaccines), for COVID-19 immunization, reaction(s): "Couldn't walk, loss of balance"; Bnt162b2 (Dose 1, she also had these reactions with the previous Pfizer Covid vaccines), for Covid-19 Immunization, reaction(s): "Couldn't walk, loss of balance", "Headache", "Neck pain", "Tremors"; Bnt162b2 (Dose 2, she also had these reactions with the previous Pfizer Covid vaccines), for Covid-19 Immunization, reaction(s): "Couldn't walk, loss of balance", "Chills", "Couldn't walk, loss of balance", "Headache", "Neck pain", "pain/Stabbing pain like a knife throughout her body/Achy all over", "low grade fever but went up to 100.6 degrees", "Tremors". The following information was reported: PYREXIA (non-serious), outcome "unknown", described as "low grade fever but went up to 100.6 degrees"; CHILLS (non-serious), outcome "unknown"; BALANCE DISORDER (non-serious), GAIT INABILITY (non-serious), outcome "unknown" and all described as "Couldn't walk, loss of balance"; HEADACHE (non-serious), outcome "unknown"; NECK PAIN (non-serious), outcome "unknown"; TREMOR (non-serious), outcome "unknown", described as "Tremors"; CONDITION AGGRAVATED (non-serious), outcome "unknown", described as "More severe reactions"; PAIN (non-serious), outcome "unknown", described as "Stabbing pain like a knife throughout her body / Achy all over/Pain". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: Caller stated she was not sure she has the right department. Product: Pfizer Covid vaccine booster, latest vaccine She got it Tuesday morning, in (withheld). Caller states she was recommended to take this vaccine by a family member who is a doctor. Caller asks are these the usual reactions? Caller states she also had these reactions with the previous Pfizer Covid vaccines, but this time they are more severe: agent had to ask Caller to reclarify some details as she was speaking very quickly, clarified information as follows: So much pain, so sick she was crying Has a low grade fever but went up to 100.6 degrees Fahrenheit Chills Tremors Stabbing pain like a knife throughout her body Couldn't walk, loss of balance Achy all over Headache Neck pain.  The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202201264913 similar report from same reporter;