diagnosed with the Delta variant; diagnosed with the Delta variant; Fever; severe muscle fatigue; vertigo; severe dizziness; congestion; This is a spontaneous report received from a contactable consumer or other non hcp. A 54-years-old female patient received bnt162b2 (Pfizer COVID-19 vaccine, Batch/Lot Number: EN6206) dose 2, via an unspecified route of administration, administered in Arm Left on 05Mar2021 around 08:30 to 09:00AM as single dose for covid-19 immunization. Medical history included hypertension from an unknown date and unknown if ongoing. There were no concomitant medications. Patient previously took bnt162b2 (Pfizer COVID-19 vaccine, Batch/Lot Number: EN6206) dose 1, via an unspecified route of administration, administered in Arm Left on 12Feb2021 around 08:30 to 09:00AM. The patient was diagnosed with the delta variant of covid-19 on 16Jul2021, severe dizziness, congestion on Jul2021, fever on 13Jul2021, severe muscle fatigue and vertigo on Jul2021. The patient underwent lab tests and procedures which included blood pressure measurement: 125/82 , body temperature: 101 Fahrenheit on 13Jul2021, body temperature: 101 Fahrenheit on 14Jul2021 and sars-cov-2 test: positive on 16Jul2021 positive result for the Delta variant. Therapeutic measures were taken as a result of diagnosed with the delta variant (covid-19), severe dizziness, congestion, fever, severe muscle fatigue and vertigo. The outcome of event fever was recovered while other event outcome was unknown. Consumer was calling about the Pfizer COVID-19 vaccine and said she had taken both doses of the vaccination, with the first being on 12Feb2021 and the second on 05Mar2021. Patient said she had the LOTs for these to provide. She would like to report breakthrough, she had been diagnosed with the Delta variant with a PCR test. She was sick, and is still sick, for six days, and the 13th was when she had her first symptoms. Patient said that the PCR results came back 16Jul after she was tested on the 15th and they confirmed Delta variant. No further details about her friend's friend provided. Pfizer COVID-19 vaccine NDC/EXP: Caller said that these details were not provided on her handwritten vaccine card. Patient said both doses had been given in her left arm she guesses, and they were given in the morning, she is not sure what time, around 08:30 to 09:00AM. She says her appointments were set for 08:45AM. Caller informs that she was not hospitalized for the COVID-19 delta variant symptoms, Patient had fever, muscle fatigue, and congestion. she had pretty severe vertigo to the point she was grabbing walls at times, and she is still really dizzy like if she stands up and turns her head, which is not normally something that she would have. Patient fever was 101 degrees Fahrenheit on 13Jul and 14th, and her fever broke the afternoon of the 14th. For AE treatment LOT is tiny: Nyquil: UPC: 2390001424, LOT: 0154171931, EXP: May2023. Caller says she has been taking this once a day by mouth at night. Caller asks if this is an old Wyeth product, she doesn't know, then says it is manufactured by Pfizer. UPC: 0573016949, LOT: R90265, EXP:  August 2023. Caller said she has been taking two PRN, clarified to being two Liquigels by mouth as needed.   Follow-Up (23Jul2021): Follow-up attempts are completed. No further information is expected.