pericardial effusion; pericarditis; mild bilateral atelectasis; having such trouble breathing; This is a spontaneous report from contactable consumers (patient and her husband). A 52-year-old female patient received bnt162b2 (BNT162B2), dose 1 at vaccination age of 52-year-old via an unspecified route of administration in the left arm on 09Mar2021 (Lot Number: EN6199) as dose 1, single for covid-19 immunisation. Medical history included ongoing pre-diabetic diagnosed about three years ago; atrial tachycardia which she had before she had Covid 19 in Oct2020 which worsened after Covid infection (the episodes became more frequent on day 4 of having Covid 19 from once a month, to weekly, to daily, then multiple times a day as well stated it felt like she would pass out and she was nauseous) which required cardiac ablation on 05Mar2021; was very sick when she had covid on Oct2020 which did not result in hospitalization; ongoing high cholesterol that was diagnosed about 10 years ago; has not regained her sense of smell that she lost during this illness; and overweight. She denies being immunocompromised. She had shingles vaccine for vaccination when she was around 50 years old (around 3 years ago) which she had flu like symptoms for about three days. Concomitant medications included takes diabetes medication, a blood pressure pill and unspecified medications. The patient did not have prior vaccination within 4 weeks prior to the first administration date of the suspect vaccine. On 12Mar2021, the patient experienced pericardial effusion, mild bilateral atelectasis, pericarditis and having such trouble breathing which resulted in hospitalization from 12Mar2021 to 13Mar2021. She inquired if she had covid and had the two shots is there any data about having a longer and more prominant/higher protection after 6 months. She also inquired if there were people with prior Covid infection had a more severe reaction to the first shot. She further inquired regarding the booster since she had a rare episode that coincided with cardiac ablation before she received her first shot on 09Mar2021. She mentioned that she had pericarditis and had to go to the emergency room 3 days after the first dose (12Mar2021) because she was having such trouble breathing. She was kept overnight, completed a CT scan with dye (Mar2021) which found the pericarditis and atelectasis as well as an echocardiogram of the heart (Mar2021) which showed the same. The husband added that her physician said that she could take the shot the next day, but they waited for 3-4 days because he thought there would be no relationship with the ablation. "He thinks it was a double whammy to her system." She has a fragile system but did okay with second dose. When they kept her overnight, they did an echocardiogram of the heart and a CT Scan with dye. The CT Scan showed the pericardial effusion and atelectasis.  At the time of the report, the patient was doing fine. It was mentioned that her first dose of the vaccine it took a couple of months for her to recover, and she was still having problems catching her breath until sometime in Jun2021. She further stated that she received her first Pfizer shot on 09Mar2021 and was hospitalized on 12Mar2021 with pericardial effusion and mild bilateral atelectasis. The adverse events resulted in emergency room and physician's office visits. The patient underwent lab tests and procedures which included blood test fibrin d dimer was elevated and blood work that showed inflammation, both on Mar2021. The outcome of the event breathing difficult was recovered sometime in Jun2021 while the outcome of the other events was recovered on an unspecified date in 2021 (reported as took a couple of months).