she had no energy; She felt like "blah"; She received the third Covid 19 vaccine on 15Aug2021; She received the third Covid 19 vaccine on 15Aug2021; tired; This is a spontaneous report from a contactable other hcp. A 77-years-old female patient received bnt162b2 (Formulation: Solution for injection; Batch/Lot Number: FC3181), dose 3 via an unspecified route of administration, administered in Deltoid Right on 15Aug2021 as dose 3, single for covid-19 immunisation (at the age of 77 years). Medical history included mitral valve incompetence from an un-known date and unknown if ongoing. The patient's concomitant medications were not reported. The patient did not receive any other vaccines within 4 weeks prior to the COVID vaccine. The patient was not received any other medications within 2 weeks of vaccination. The patient previously received first dose of bnt162b2 (lot number EL9265) on 30Jan2021 and Second dose of bnt162b2 (lot number EL9266) on 23Feb2021 for covid-19 immunisation. On 15Aug2021 patient experienced tired, she felt like blah, on 16Aug2021 she had no energy. Retired nurse, who is a patient, received the primary dose series of the Pfizer COVID 19 vaccine in Jan2021 and 2nd dose on 23Feb2021. Due to her autoimmune condition, she received the 3rd dose of the vaccine on 15Aug2021. She wants to know if the 3rd dose that she received will be called as her booster vaccine. Also asking if she ever need to have the 4th dose as her booster. She is calling about a phone number she received a weird call that had Pfizer's name on the caller ID. She provides phone number #. She is asking if Pfizer makes calls out. She reports she is a nurse, and she has received her Covid 19 vaccines. She received her third Covid 19 vaccine because she has autoimmune issues. When probing if she is calling about an adverse event because she was originally inquiring about the phone number, she states she didn't have any problems, but she was tired. She felt like blah the next day, she had no energy. She did not have a fever or cough. She states she is a retired nurse, and she is asking if the third Covid 19 vaccine is considered a booster. She again repeats after the third Covid 19 vaccine she felt tired, like blah, with no energy, but it might be her age too. She has shrunk. She states she still feels tall when she puts on high heels to go to church she sees over some people's heads. She states she has mitral valve regurgitation it's different from mitral valve prolapse. She had the mitral valve regurgitation prior to receiving any dose of the Covid 19 vaccine. When probing for adverse events with any other vaccines she reports she never has problems with vaccines, and she gets her flu vaccine every year. She reports she had some tiredness the evening she received the third Covid 19 vaccine, but the tiredness was worse the second day. But she is retired and a lot of times it's hard to tell if she's tired because of her age. She states she doesn't have shortness of breath and her heart isn't affected in that manner. She doesn't have congestive heart failure or a de-creased ejection fraction. She can't relate her lack of energy to her heart. She is asking when she will find out if she will need another Covid 19 booster. Adverse events were not required a visit to Emergency Room/ Physician Office. The outcome of the event was unknown.  Follow-up attempts are completed. No further information is expected.