Patient received 2 Moderna shots, either 1 or 2 boosters that thinks were also Moderna, then received Pfizer COVID-19 vaccine bivalent shot; long-haul joint symptoms were gone within 3 weeks; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team.  A 73-year-old female patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), in 2022 as dose number unknown (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history included: "COVID" (unspecified if ongoing); "pneumonia" (unspecified if ongoing); "joint pain in lower joints" (unspecified if ongoing); "bursitis in shoulder" (unspecified if ongoing); "mild levels of arthritis in knees" (unspecified if ongoing); "anemia", start date: Mar2022 (unspecified if ongoing), notes: had anemia that was diagnosed early last year, thinks Mar2022; "sciatica" (unspecified if ongoing). The patient took concomitant medications. Vaccination history included: Moderna covid-19 vaccine (DOSE 1, SINGLE), for Covid-19 immunization, reaction(s): "3rd time patient had Covid was in Dec2022"; Moderna covid-19 vaccine (DOSE 2, SINGLE), for Covid-19 immunization, reaction(s): "3rd time patient had Covid was in Dec2022"; Moderna covid-19 vaccine (DOSE NUMBER UNKNOWN (BOOSTER), SINGLE), for Covid-19 immunization, reaction(s): "3rd time patient had Covid was in Dec2022,".  The following information was reported: INTERCHANGE OF VACCINE PRODUCTS (non-serious) with onset 2022, outcome "unknown", described as "Patient received 2 Moderna shots, either 1 or 2 boosters that thinks were also Moderna, then received Pfizer COVID-19 vaccine bivalent shot"; THERAPEUTIC RESPONSE UNEXPECTED (non-serious) with onset 2022, outcome "unknown", described as "long-haul joint symptoms were gone within 3 weeks". Relevant laboratory tests and procedures are available in the appropriate section.  Additional Information: Caller was a consumer and was calling for a friend. He stated that the individual who had long-covid and had covid twice before, was suggested to get the Pfizer covid19 Bivalent shot and then that took away the inflammation that was lingering for many many months almost a year. Caller stated that the patient took the dose in late September and the beginning of October of last year, and wanted to know if she can take the vaccine again. Caller later stated that the patient had covid a 3rd time, and had read that the last bivariant 5 could cause joint pain, hand and toe and fingers. The pain was going from the lower joints to the hands. Caller stated that after the patient took the Pfizer vaccine, that, "long-haul joint symptoms were gone within 3 weeks". Caller also stated that some of the symptoms came back, in her hands primarily and she had, "joint pain in the hands for a couple of months. She took the oral immune test and it didn't show. It was definitely inflammation and didn't had arthritis, and this all came about after they had covid the 3rd time. Subsequent to patient September vaccination, in December when a round of Covid came back again, patient didn't have joint problems before, didn't have inflammation of hands. Patient has had Covid 3 times. First time having Covid was pretty bad, patient had pneumonia and was hospitalized the first time, later clarified and confirmed during call that this was prior to patient receiving any doses of the Modera shot or the Pfizer COVID-19 vaccine bivalent shot. Then subsequent to patient having Covid the first time, patient started getting joint pain in lower joints. Patient had bursitis in shoulder before having Covid and had mild levels of arthritis in knees, but no arthritis in feet or hands, but then had Covid and started getting joint pain in lower joints. 1st time patient had Covid was prior to patient receiving the Moderna shots or the Pfizer COVID-19 vaccine bivalent shot. Then patient received the 2 Moderna shots, caller unknown the specific name of product, just knows it was the Moderna original 2 shot series. Patient's symptoms began after patient had Covid the first time and got progressively worse, patient had joint pain in fee, knees, and hips. 2nd time patient had Covid was after patient received the 2 Moderna shots, was 8 or 9 months later. Patient's joint pain in hands did not start until Jan2023. Patient had other pain after the 2nd time patient had Covid, patient had more extensive joint pain, could not walk that much, had mobility issues because of the joint pain. Patient received the Pfizer COVID-19 vaccine bivalent shot in either late Sep2022 or early Oct2022 and patient's symptoms were gone within 3 weeks, clarified patient was able to have greater mobility and the joint pain went away almost completely, by the end of Oct2022 patient's lower joint issues in feet, knees, and hips were almost gone and bursitis is almost gone in shoulder. Plus patient had sciatica which dissipated as well. 3rd time patient had Covid was in Dec2022, so that brought hand joint pain in early Jan2023, so looks like directly related to the Covid patient had in Dec2022, had some symptoms but no long issues. Then patient had either 1 or 2 boosters that caller thinks were also Moderna, caller unknown the specific name of product. Then caller suggested the Pfizer COVID-19 vaccine bivalent shot to patient from reading caller did that this vaccine seems to be one that could help for long haul Covid. This was patient's 4th or 5th total dose, caller thinks this was patient's 5th total dose because patient had the Moderna original 2 shot series then patient had either 1 or 2 boosters that caller thinks were also Moderna. There are a number of people who took vaccines and boosters and 30 to 40 percent had relief from long haul Covid symptoms based on caller's readings. Patient had anemia that was diagnosed early last year, thinks Mar2022. Patient recovering from anemia conditions, anemia improved due to better diet and supplementations. Patient has never taken any rheumatoid arthritis medication because of side effects and was not clear if patient had rheumatoid arthritis, believes the Covid could cause autoimmune issues, that is why patient held off on taking the medication and then patient did a test recently and found patient has no autoimmune disease even though some symptoms were joint pain and might indicate rheumatoid arthritis disease.  Follow-up attempts are completed. No further information is expected.