Infection; Keloid scar; This is a spontaneous report from a contactable consumer or other non hcp. A 60-years-old female patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Batch/Lot Number: EN6199),via an unspecified route of administration on 04Mar2021 as single dose for covid-19 immunisation.The patient's medical history and concomitant medications were not reported. Received the Pfizer vaccine on March 4th after which she underwent a "small procedure" and got an infection. Her treating hcp put her on a course of Septra to treat the infection. She read that patients taking Seprta should not receive vaccines and she is worried as she is schedule for her next Covid vaccine on 25Mar. She wanted to know if she has done something to decrease the efficacy of her vaccination series. Caller's question is if it's an issue for patients taking Septra to receive the Pfizer Covid-19 vaccine. Will this diminish the effectiveness of the vaccine.  As a response, Brand Septra has been discontinued. Caller stated that she read on WebMD that patients taking Septra should not receive live vaccines such as oral typhoid while taking Septra. Is the Pfizer Covid-19 vaccine a live vaccine. As a response, a patient cannot get the covid virus from this vaccine. It is not considered to be a live vaccine. Caller is calling about the Pfizer COVID vaccine. She did something most people probably don't do, she googled to see if their are drug interactions. She got the first one 04Mar and she is scheduled to get the second one 25Mar and then last Friday she developed an infection after a small procedure and they put her on Septra and she was doing some reading if there were any interactions and she read do not get any vaccinations while taking this medicine and she was like oh my God but then she also read something else where it said its okay it doesn't effect it there are not any interactions with the medicine. She had been living in a bubble for over a year and she really does not want anything to mess up the efficacy of her vaccine. She asks if they have any information on if she takes this medicine if it will effect the vaccine. She says the procedure was just a weird little thing she had done on her belly button. The dermatologist have been working on, she had a laparoscopic procedure that created a keloid scar, they have been working on that. She had the procedure and they just snipped something off and she thought it was going to heal just fine and it seem to be healing then she went to get her vaccine and everything was fine but it got infected. They said it was nothing of her fault but they put her on Septra and she actually ended up googling just to see because she knows with some antibiotics they will say not to take with dairy or things like that and she was trying to make sure if there was anything she needed to watch out for because she wanted the optimum experience out of the antibiotic because the infection in her belly button is pretty bad. While she was reading she seen do not take any vaccinations while taking the medicine and she thought oh my. She says she started the Septra Saturday 13Mar and she will be continuing to take that, it is prescribed for 10 days, she says that would be the 23Mar and she is supposed to get the second dose on the 25Mar. She doesn't think there is anything else to add. She knows this is new and there may not have been enough time to do testing on every different antibiotic but she did read some stuff online from (website) and some other things that said you can go ahead and it does not interact, that people can go ahead and take the antibiotic but she would rather call Pfizer and find out. Therapeutic measures were taken for AE. Outcome of the events was unknown.  No follow-up attempts are needed. No further information is expected.