she got RSV during Christmas/RSV test came back positive.; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the parent.  A 19 year-old female patient received bnt162b2 (BNT162B2), administered in arm, administration date 05May2021 (Lot number: EN0173) at the age of 18 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "Covid", start date: Jan2021 (unspecified if ongoing), notes: COVID; "mild chest pains", start date: Jan2021 (ongoing), notes: mild chest pains; "Acne" (unspecified if ongoing); "blood clot" (unspecified if ongoing). The patient took concomitant medications. Vaccination history included: Bnt162b2 (Dose:1, lot number:EW0161   , Injected in unknown arm.), administration date: 14Apr2021, when the patient was 18 years old, for Covid-19 immunization, reaction(s): "chest pains worsened", "chest pains worsened", "costochondritis". The following information was reported: RESPIRATORY SYNCYTIAL VIRUS TEST POSITIVE (non-serious) with onset 2021, outcome "unknown", described as "she got RSV during Christmas/RSV test came back positive.". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: It was reported that reporter's 19-year-old daughter had mild chest pains when she had Covid in Jan2021. When she received the first Pfizer vaccine, her chest pains worsened, and it has not gotten better today. The doctors say it was costochondritis. We have tried everything and she has taken several tests and x-rays. Nothing was helping her and these chest pains were preventing her from participating in her sport at college. She was taking Contraceptive for Acne, but stopped because they thought she had blood clots. She did not remember the date she was diagnosed. They have been to emergency rooms and urgent care. It was sometime between the first vaccine and today. They tried Chiropractor, Acupuncture. and everything. They did X-rays, CT scan, Blood test, and an EKG. All were normal. Then, they spoke with her doctor after that to follow up and that is when her doctor said Costochondritis. Then, later she had an ER visit for the same thing. They did X-ray, blood test and nothing showed up. They had no answers. When she got RSV, they did not know it at the time. So, her chest was hurting and they did COVID test, RSV test and 2 flu tests. RSV test came back positive. They gave Steroids for 5 days and eased pain a little.  It did get worse when she got the RSV. She did not have the name, lot or expiration of the steroid. She has already used them and has no sample. At her school, she was on a division one rowing team and they have a doctor, but has not been much help. They gave her Physical Therapy and it did not work, and did some electro shock type things on chest, which did not work either. They prescribed her some Pain medication, but that gave her migraines, so she stopped. She did not know the name, lot or expiration of the pain medication. They tried chiropractor adjustments and acupuncture. The Acupuncture relieves it, but it always comes back. There was no additional vaccines administered on same date of the Pfizer suspect and Prior Vaccinations within 4 weeks. It was informed that reporter's mother was a Type 2 diabetic. Her other children were healthy and very active.   No follow-up attempts are possible. No further information is expected.