had Covid; had Covid; Interchange of vaccine products; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from product quality group. The reporter is the patient.  A 61-year-old female patient received BNT162b2 (BNT162B2), on 26Feb2021 as dose 1, single (Lot number: EL1283), on 19Mar2021 as dose 2, single (Lot number: EN6208) and on 04Aug2022 as dose 4 (booster), single (Lot number: FP7138) for covid-19 immunisation; elasomeran (MODERNA COVID-19 VACCINE), on 26Oct2021 as dose 3 (booster), single (Lot number: 017F21A) for covid-19 immunisation. The patient's relevant medical history included: "cancer survivor Cancer in 2021", start date: 2021 (unspecified if ongoing), notes: cancer survivor Cancer in 2021. Concomitant medication(s) included: SHINGRIX taken for immunisation as dose 1, single. The following information was reported: INTERCHANGE OF VACCINE PRODUCTS (medically significant) with onset 26Oct2021, outcome "unknown"; DRUG INEFFECTIVE (medically significant), SUSPECTED COVID-19 (medically significant) all with onset 23Dec2022, outcome "unknown" and all described as "had Covid". The patient underwent the following laboratory tests and procedures: Body height: About 5. 5; Body temperature: 98.4, notes: Oral thermometer showed her temperature was 98.4; 100, notes: Came home, did mercury thermometer and it was 100; Weight: Could be around 174.  Clinical course: Caller had Bivalent, most recent booster, that protects from both infections. Had Covid from 23Dec2022 until about 04Jan2023. Had fever the whole time. Went to pharmacy at work and wanted to get vaccine. Asked how quickly after returning form work, 06Jan2023, she could get the booster. They said 2 weeks. Did that, this past Friday. Her concern is, does not know whether some side effects she is having now could be related to something she ate yesterday. Is asking, based on evidence working with people who had the Bivalent booster. Had that booster Friday and does not know and, the pharmacy did not tell her in terms of side effects, when they might pop up. Over the weekend, had no problems, which was great. In the past, had some issues with Moderna and the Pfizer vaccines. The Moderna gave her the problem. Had a very strong, not anaphylactic reaction but, strong reaction to the Moderna vaccine. It gave her a lot of comfortability. Last night, had something to eat and, right after she ate, had some stomach discomfort that continued into this morning. Came home from work early. Oral thermometer showed her temperature was 98.4. Knows with fever, it can change throughout the day. Came home, did mercury thermometer and it was 100. Occurred to her that she either took the vaccine too early or, was having some other kind of stomach issues over something she ate. Thought she better check to see what is considered the normal time frame to expect side effects and, if so, how soon after would they develop?. Reported to Pfizer about first shot she took in Mar2021. At that point, had unbelievable sleep reaction. Did not have any other problems, other than she slept unbelievably long period of time. Went ahead and reported that to Pfizer. Was 26Feb2021 when that first reaction happened. Most people have reaction to second and she had reaction to first. Despite the vaccines she had, 23Dec2022, had extremely uncomfortable, difficulty with almost every symptom of Covid. Did have taste and smell but, did have something slight that she couldn't smell. Could taste food but couldn't eat. Had fever every day from 23Dec2022 until 04Jan2023. Had difficulty breathing in middle of night, had to use allergy medicine to be able to find relief breathing, including steam. Had diarrhea and could only eat ice chips for a period time. Was miserable. Was pretty awful but, didn't go to the hospital. When looking at what pharmacy input in medical chart, the vaccine she had 20Jan2023 was Moderna Bivalent Booster and not Pfizer Bivalent booster. Clarified that this recent Bivalent booster that she is reporting symptoms with and asking questions regarding is Moderna Bivalent Booster. Caller advised that she would need to contact Moderna regarding any questions with the Bivalent booster. Caller clarifies that she did have problems with the Moderna product. Has received 3 Pfizer shots and this particular pharmacy apparently now providing the Moderna.