very low-grade fever (99.5 F); I was sick and stayed mostly in bed; headache; slight chest pain; slept a lot that day; slight dizziness; feeling achier in my arm that I had been originally; feeling tired/my body felt really heavy; feeling tired/my body felt really heavy; feel more severe body aches; chills; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 21-year-old patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 14Sep2022 at 10:30 as dose 4 (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: Moderna vaccine (DOSE 1,SINGLE, (Mar and Apr2021)), administration date: Mar2021, for Covid-19 Immunization; Moderna vaccine (DOSE 2, SINGLE, (Mar and Apr2021)), administration date: Apr2021, for Covid-19 Immunization; Bnt162b2 (Primary immunization series completed. First booster - Dec2021 - Pfizer), administration date: Dec2021, for COVID-19 immunization. The following information was reported: CHILLS (non-serious) with onset 14Sep2022, outcome "recovered" (16Sep2022); PAIN (non-serious) with onset 14Sep2022, outcome "recovered" (16Sep2022), described as "feel more severe body aches"; PAIN IN EXTREMITY (non-serious) with onset 14Sep2022, outcome "recovered" (16Sep2022), described as "feeling achier in my arm that I had been originally"; FATIGUE (non-serious), DISCOMFORT (non-serious) all with onset 14Sep2022, outcome "recovered" (16Sep2022) and all described as "feeling tired/my body felt really heavy"; DIZZINESS (non-serious) with onset 14Sep2022, outcome "recovered" (16Sep2022), described as "slight dizziness"; ILLNESS (non-serious) with onset 15Sep2022, outcome "recovered" (16Sep2022), described as "I was sick and stayed mostly in bed"; HEADACHE (non-serious) with onset 15Sep2022, outcome "recovered" (16Sep2022); HYPERSOMNIA (non-serious) with onset 15Sep2022, outcome "recovered" (16Sep2022), described as "slept a lot that day"; CHEST PAIN (non-serious) with onset 15Sep2022, outcome "recovered" (16Sep2022), described as "slight chest pain"; PYREXIA (non-serious) with onset 15Sep2022, outcome "recovered" (15Sep2022), described as "very low-grade fever (99.5 F)". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of dizziness, pain in extremity, fatigue, discomfort, pain, chills, pyrexia, illness, headache, chest pain, hypersomnia. Additional information: The patient was never previously infected with COVID-19.The patient received shot on Wednesday, 14Sep2022 at around 10:30 AM from local. The patient had no major pain in the injection site in the hours after receiving the shot, but within a day the patient was feeling achier in my arm that the patient had been originally. No symptoms started to occur until 5 PM on the 14th, when the patient began feeling tired/my body felt really heavy (i.e. walking or going up stairs was more laborious). The patient started to feel more severe body aches and chills around 9 PM that night, and by midnight, the patient had a very low-grade fever (99.5 F). All of Thursday the 15th, the patient was sick and stayed mostly in bed, treating with OTC acetaminophen and ibuprofen every 4-6 hours. The patient's low-grade fever was on and off and finally got kicked by the evening of the 15th. The patient's symptoms otherwise were a headache, body aches, chills, and slight chest pain. The patient slept a lot that day and needed to take the day off of work. On the morning of the 16th, the patient's only symptom was slight dizziness/a headache, but that went away as the day progressed. By the evening of the 16th, the patient felt back to normal.  The information on the batch/lot number for BNT162b2, BNT162b2 omi ba.4-5 has been requested and will be submitted if and when received.