Atrial fibrillation; heart rate was erratic, but not as much as yesterday and today.; Her blood sugar is steady in 160s where it is normally lower in the 120s, 130s, and 140s.; This is a spontaneous report from a contactable consumer (patient). An 85-year-old female patient received second dose bnt162b2 (BNT162B2, Solution for injection) via an unspecified route of administration on 20Feb2021 (Batch/Lot Number: EL9266; Expiration Date: 31May2021) as single dose for covid-19 immunisation. Medical history included ongoing diabetes mellitus, thyroid, ongoing bone strength. Concomitant medications included ongoing insulin lispro (HUMALOG) (over 150 take two units) for Diabetes, ongoing insulin (30 units of insulin) taken for diabetes, ongoing levothyroxine sodium (SYNTHROID) (25mcg one tablet in the morning) taken for thyroid, ongoing Lisinopril (40mg one in the morning) for Blood pressure and ongoing Nifidepine (90 mg two and half hours after lisinopril) for blood pressure abnormal, ongoing Atorvastatin (one 20mg tablet at night), ongoing colecalciferol (D3) (25mcg one in the morning), cyanocobalamin (VITAMIN B12) (1,000mcg time release in the morning), Magnesium oxide at 400mg, ongoing calcium carbonate, colecalciferol (CALTRATE 600+D3) taken for bone strength.  Historical vaccine included BNT162B2 (30mcg/0.3mL, lot: EL9265, expiration: 31May2021) on 30Jan2021 at 85 years for Covid-19 immunization. It was reported that, she has not had any problems. She goes to the doctor regularly. She has an apple watch, and she does check her heart. She also walks and tracks her steps. The last two weeks, she has noticed something knew. She has developed atrial fibrillation on an unspecified date in Feb 2021. She was concerned. She will do whatever her doctor suggests. She has read that two of the side effects are blood clots and t cells and a changing heart. She has not had atrial fibrillation in the past. She does check her heart. It was just something she does. She has had heart tests before. They checked her out last year 2020. On an unspecified date in 2020, they did a stress test and everything was fine. Everything was fine until last week. Everything was normal before that. The atrial fibrillation started last week. She decided to wait another week to see what happened. Then yesterday, the atrial fibrillation started again with all sort of swiggles. Her watch shows afib or inconsistency. It has been off the wall yesterday and today. She didn't have a prescribing doctor. The health department put up a screen on their website for people 80 and over so she signed up. She goes to the doctor this Thursday. She has diabetes, but it was under control. She takes insulin and Humalog for extra coverage. Her blood sugars have steadily been higher than normal. She took her heart rate on and off last week. It was over a couple of days. Her heart rate was erratic, but not as much as yesterday and today on an unspecified date in Feb2021. Her blood sugar was steady in 160s where it was normally lower in the 120s, 130s, and 140s on an unspecified date in Feb2021. The outcome was not recovered for atrial fibrillation, and unknown for erratic heart rate and blood sugar levels increased.    No follow-up attempts are possible. No further information is expected.