all day in bed, couldn't get up; lost 3lbs; UTI; no appetite/Does not have the same appetite she normally does; extreme fatigue; chills "now and then"; nausea; Slept all day; back and stomach muscle aches; back and stomach muscle aches; Fever; Felt icky; This is a spontaneous report from a contactable consumer (patient). A 79-years-old female patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Lot Number: EN6202) (79-years-old at the time of vaccination) via an unspecified route of administration, administered in arm left on 04Mar2021 as dose 1, single for COVID-19 immunization. The patient medical history was not reported. As concomitant medications patient took quite a bit of medications, like 35 pills a day and a lot of loperamide hydrochloride (IMODIUM). Patient reported that she had the first dose on 04Mar2021 (Thursday) and reported that the next day she felt fine up until 06Mar2021 (Saturday) at supper time, she felt icky. She said that on 07Mar2021 (Sunday) when she woke up at like 1000, she slept all day, had back and stomach muscle aches that she treated with Motrin, had no appetite, extreme fatigue, chills, fever, and nausea. She said that she was taking Zofran and took 1 Phenergan for the nausea. She did not eat almost all day on Sunday. She said that she sells asleep at about 11:00 on Sunday and woke up at 16:30. She zonked right out. She said that she had extreme fatigue. She did not know if she had a reaction if she can have a delayed reaction from the vaccine. Since Sunday, every day has been a little better. She said that on an unknown date she lost 3lbs and she only weighs 80lbs now. She reported that she does not have the same appetite she normally does. This morning she was a little nauseous and had to lay down and stated that she did not want to throw up. She said that her nausea and her poor appetite were better, but they were not good yet. The last couple of days her urine was darker than normal. She said that she thought it was a UTI. She called her doctor and was sent to have a urine sample test (urinalysis) on 11Mar2021, and it came back positive for a UTI. She said that she has not picked up the antibiotic for the UTI yet. Caller said that she noticed the darker urine on either Thursday or Wednesday. She said that the urine was a little darker than tea coloured. She said that she felt like she carried something real heavy and on Sunday she could hardly move. She said that she was not eating like she should be and was still a little nauseated and her appetite was not good yet. Caller stated that it had improved a little bit. Caller said that she could hardly dial or text because she was shaking so bad from the chills. Then she would feel warm. She stated that the chills come and go, but have improved. She stated that she has not taken her temperature. She wondered if the UTI was causing her stuff now. She said that she can't pick up her Antibiotic for the UTI until tomorrow. Outcome was not resolved for the event UTI, unknown for fever and lost 3lbs and the outcome for event back and stomach muscle aches was resolved on 10Mar2021 and outcome for rest events was resolving.   No follow-up attempts are possible. No further information is expected.