slight sore arm; slight chest congestion; positive COVID-19 test after first dose of vaccine; positive COVID-19 test after first dose of vaccine; Fever; cold like symptoms; stuffy head; horrible headache; Cough; This is a spontaneous report from a contactable healthcare professional (patient) from a Pfizer-sponsored program, Pfizer First Connect. A 44-year-old female patient received the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE), via an unspecified route of administration, on 16Dec2020 as a single dose (reported as 0.3 mL) (at the age of 44-years-old) for COVID-19 immunization. Medical history included ongoing hypothyroidism, one thyroid gland removed due to a nodule on an unspecified date (years ago), ongoing acid reflux, ongoing hypercholesteremia, ongoing fluid retention, and ongoing history of headaches. Concomitant medications included levothyroxine sodium (SYNTHROID) taken for hypothyroidism and for one thyroid gland removed due to a nodule from an unspecified date and ongoing, dexlansoprazole (DEXILANT) taken for acid reflux from an unspecified date and ongoing, atorvastatin (LIPITOR) taken for hypercholesterolemia from an unspecified date to an unspecified date, and hydrochlorothiazide (MANUFACTURER UNKNOWN) taken for fluid retention from an unspecified date and ongoing. Additional concomitant medications included unspecified vitamins. The patient had a positive COVID-19 test after first dose of vaccine on 01Jan2021; cold like symptoms, stuffy head, horrible headache, cough, and fever on 31Dec2020; slight chest congestion on 02Jan2021; and slight sore arm on an unspecified date. The events, stuffy head and horrible headache, were reported as medically significant. The events, cough, fever, and slight chest congestion, were reported as non-serious. The clinical course was reported as follows: It was reported that the patient was vaccinated on 16Dec2020, became symptomatic on 31Dec2020, and tested positive for COVID-19 on 01Jan2021. The patient stated that she became symptomatic one day prior to testing positive for COVID-19, on 31Dec2020. She initially had cold-like symptoms with a stuffy head, cough and a horrible headache; the worst headache she had ever had. These symptoms occurred earlier in the day on the 31Dec2020. Then later that night about 10:00 PM, she had a fever with a body temperature of 102 degrees Fahrenheit. Her body temperature had been normal at 98 degrees all day that day until that night. She also had slight chest congestion and then was fever free for over 48 hours. The patient stated that she had a history of headaches and can tolerate a headache. The headache started 31Dec2020 and was significant. It was reported that after the vaccine, she had no other symptoms other than a slight sore arm, which lasted a day; maybe 24 hours after she received the vaccine. The patient stated that she does not think any of the other symptoms, other than the sore arm, have anything to do with the vaccine. The clinical outcome of positive COVID-19 test after first dose of vaccine and slight sore arm was unknown; cold like symptoms, horrible headache, and cough was recovering; fever was recovered on 02Jan2021; and stuffy head and slight chest congestion was not recovered. The reporter assessed the causality assessment between the events, positive COVID-19 test after first dose of vaccine, cold symptoms, stuffy head, cough, horrible headache, fever, and slight chest congestion, as unrelated.  The batch/lot number for the vaccine, BNT162B2, was not provided and has been requested during follow up.; Sender's Comments: The efficacy of a drug varies from one patient to another and can be affected by different factors; however, a contributory role of the suspect drug BNT162B2 to the reported events cannot be ruled out. The impact of this report on the benefit/risk profile of the Pfizer product is evaluated as part of Pfizer procedures for safety evaluation, including the review and analysis of aggregate data for adverse events. Any safety concern identified as part of this review, as well as any appropriate action in response, will be promptly notified to RAs, Ethics Committees, and Investigators, as appropriate.