chills; fever/fever was 100.1; diagnosed with a UTI; soreness at the injection site; This is a spontaneous report from a Pfizer-sponsored program via a contactable consumer (patient). A 41-years-old female patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Batch/Lot Number: EN9581, Expiration date was not reported) via an unspecified route of administration, administered in arm left on 13Feb2021 as first dose, single for COVID-19 immunization in a vaccine clinic (patient age at time of vaccination: 41 years) (indication: she worked in healthcare, not first line, but occasionally she was seeing patients). The patient medical history and investigation assessment was none. Concomitant medication included vitamin d nos (VITAMIN D; she used to take it consistently through the winter) taken for an unspecified indication, start and stop date were not reported. No previous immunization with the Pfizer vaccine considered as suspect. No additional vaccines administered on same date of the Pfizer suspect and she had refused any other vaccination until after the COVID vaccine. They had asked her if she wanted the flu vaccine, but she declined it. No adverse events following prior vaccinations. The patient got the first dose of the Pfizer Covid 19 vaccine on 13Feb2021 and since then, she began having UTI symptoms, was diagnosed with a UTI (start date: 26Feb2021) and prescribed nitrofurantoin mono 100mg twice daily therapeutic measures for UTI. On 03mar2021 (today), the patient had developed fever and chills. Her second dose of the vaccine was scheduled for 06Mar2021. She did see a Nurse Practitioner for the UTI. No emergency room visit was done. She had soreness at the injection site and up until 03Mar2021 (today) that was all she felt was related to the injection. She was being treated for a UTI and 03Mar2021 (today) she had fever and chills; her fever was 100.1 (onset: 03Mar2021). She hadn't seen her primary care doctor in a while. Soreness at the injection site was within a few days of the injection it felt like someone punched her in the arm. Soreness at the injection site was the next day and the day after. It was mild discomfort. Soreness at the injection site had gone away by the third day after injection. The UTI symptoms started on 26Feb2021 (last Friday) and she was being treated with the antibiotic nitrofurantonin mono 100mg caps, started on 26Feb2021 (nitrofurantonin was in the pharmacy vial and she didn't see a lot number). She was taking it twice a day with meals. The patient was fairly certain the UTI wasn't caused by the vaccine and clarified that she wanted information about being on the antibiotic nitrofurantonin and receiving the second dose. The patient was asking if she will continue to the second dose of Covid 19 vaccine this coming 06Mar2021 and do we had any info about being on this antibiotic and taking vaccine. She was not sure if she was in the right place, she was experiencing some symptoms and not sure if they were directly related to the vaccine and she was due for the second dose on 06Mar202 (Saturday). The patient would like to file a report about her initial experience but didn't think what she currently was experiencing is in direct relation to the vaccination. The patient underwent lab tests and procedures which included Body temperature at 100.1 (fever 100.1) on unspecified date. The outcome for all events was unknown.  Product Complaint: Yes; Description of Product Complaint: Reporting adverse event with Pfizer COVID19 Vaccine. The UTI symptoms started last Friday, 26Feb2021. She was being treated with the antibiotic nitrofurantonin mono 100mg caps. She was taking it twice a day with meals. She started nitrofurantonin on 26Feb2021. Today she had fever and chills. Her fever was 100.1. Nitrofurantonin is in the pharmacy vial and she didn't see a lot number.   No follow-up attempts are possible. No further information is expected.