received the vaccine on December 17th and tested positive for Covid on December 27th/COVID PCR (polymerase chain reaction) test: positive on 28Dec2020; received the vaccine on December 17th and tested positive for Covid on December 27th/COVID PCR (polymerase chain reaction) test: positive on 28Dec2020; This is a spontaneous report from a Pfizer sponsored program Pfizer First Connect. A contactable nurse (patient) reported that a 65-year-old female patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Batch/lot number: EK5730), via an unspecified route of administration on 17Dec2020 11:00 in left deltoid at single dose for covid-19 immunization. Medical history included thyroid cancer from an unknown date and unknown if ongoing, bilateral thyroidectomy in 2014. Family Medical History: Father died of lung cancer. Mother died of cardiac arrest in 1972. Concomitant medication included levothyroxine sodium (SYNTHROID) for bilateral thyroidectomy. The patient received the vaccine on 17Dec2020 and tested positive for covid on 27Dec2020. The adverse events resulted in emergency room visit. The patient underwent lab tests and procedures which included tested positive for COVID on 27Dec2020, COVID PCR (polymerase chain reaction) test: positive on 28Dec2020. Vaccination facility type was hospital. No additional vaccines administered on same date of Pfizer suspect. Received COVID Vaccine on 17Dec2020. Tested positive for COVID in emergency room on 27Dec2020. Tested positive on a COVID PCR test on 28Dec2020. Prior vaccinations within 4 weeks was none. Caller received the first dose of the COVID Vaccine. Tested positive for COVID on 27Dec2020. Is about to get the second dose of COVID Vaccine and would like to know if she should proceed or wait. Since quarantine, she has had no fever. Is slightly short of breath and has a headache. Works in COVID units in a hospital. Wants to make sure she can receive the second dose. Stated she had no adverse reaction to the COVID Vaccine unless an adverse reaction can occur two weeks after. Is attributing the shortness of breath and headache to testing positive for COVID. Shortness of breath and headache only occurred after testing positive for COVID. Reason she went to the hospital is because she lost her sense of smell. She got tested and was positive for COVID. Lost sense of smell, went to Emergency Room, and notified doctor of positive test the following day, 28Dec2020. Clarified she just went to the emergency department to get tested for COVID and then went home. Was called with positive results in an hour. Caller wanted to know when she should proceed with getting her second dose of Covid vaccine. She is supposed to receive her second dose tomorrow. She thought she was going to take second dose when I completely recovered. Caller asked if she waited until the 13th to receive second dose of Covid vaccine, would it be effective. She would feel more comfortable doing that. The outcome of events was unknown.; Sender's Comments: Based on the information available, a possible contributory role of the suspect BNT162B2 cannot be excluded for the reported COVID-19 based on the known safety profile. However the short duration of 9 days since the vaccine first dose is given it is unlikely patient would have fully developed immunity.