tested positive for covid19; tested positive for covid19; This is a spontaneous report received from contactable reporter(s) (Pharmacist) from medical information team and product quality group for a Pfizer sponsored program.  A 19 year-old female patient received bnt162b2 (BNT162B2) (Batch/Lot number: unknown) as dose 2, single and (Batch/Lot number: unknown) as dose 1, single for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. The following information was reported: COVID-19 (medically significant), DRUG INEFFECTIVE (medically significant) all with onset 31Dec2021, outcome "unknown" and all described as "tested positive for covid19". The patient underwent the following laboratory tests and procedures: sars-cov-2 test: (07Jan2022) positive; (09Jan2022) negative; (31Dec2021) positive. Enquired, call transferred. Stated that, the pharmacist has a patient that tested positive for covid 19 in the last 14 days and wanted to know when the soonest they could get their first dose of the Pfizer covid 19 vaccine. The caller clarified and stated that, his patient had already received the first two doses of the Pfizer covid 19 vaccine, adult formulation and in the last 14 days tested positive for covid-19, on 07Jan2022. Stated that, it was the booster dose he asked about. Stated that, he had spoken to a couple of people and gotten several different answers and wanted to call Pfizer. The caller stated that, his understanding was to follow the 10 day quarantine and test negative after the ten days. Enquired that, was there any guidance. Stated that, new reporter was added. The reporter seriousness for the events was reported as unspecified. It was reported that, warm transfer from (name) with Medical Information: INT-00545795. Transfer agent has pharmacist on the line who was initially transferred to her. The pharmacist was reporting a 19-year-old female patient received 2 doses of the Pfizer Covid-19 Vaccine. Stated that, she wanted to get the booster dose. Stated that, the pharmacist was called to see the soonest possible time patient would be able to get vaccine. The description of product complaint included pharmacist on the line reporting on Pfizer Covid-19 Vaccine. Stated that, a patient has received both doses of the vaccine. The pharmacist was called to see the soonest possible time patient would be able to get vaccine. Stated that, the dates of the first and second dose were unknown to transfer agent, but it's been at least five months now since having second dose. The patient tested positive for covid on 07Jan2022. After transfer, the caller confirmed patient received 2 doses of the Pfizer Covid-19 Vaccine and has tested positive for covid. After transfer, the caller further clarified that, the patient first tested positive with a PCR test on 31Dec2021. She did a home test on 07Jan2022 and it was positive. She did another home test on 09Jan2022 and it was negative. The caller stated that, he was at work and pressed for time. He did not had time to continue with report. The patient has already left the pharmacy and would come back at another time. Stated that, he got some information from the CDC website and he was called to see what/if any other information Pfizer had. The caller stated that, if they wanted to email questions he would gladly respond to those via email.  The lot number for bnt162b2 was not provided and will be requested during follow up.; Sender's Comments: Based on known drug safety profile, there is reasonable possibility of causal association between the events Covid 19 and Drug Ineffective and the suspect drug BNT162B2.