According to the current literature I am a a rare exception. Pfizer Phase 3 trial participant full vaccinated in late September . A few weeks ago I still had antibodies from the vaccine and never had covid. (Results from blood donation).
June 15th I came down with moderate to severe covid. (102.9 Fever for over a week, all covid symptoms other than loss of taste and smell, 20lb lost in two weeks.). I just returned to work today. Pfizer overnighted a swab to me to get a sample during the first week, and had a courier pick it up. But I was told they will not tell me what they discover from it.(such as which variant etc, I am just a number to them).
I had to go to ER, but the EMT who came to my house when I had difficulty breathing and SP02 was going down said, "Oh you have covid, there is no treatment for that so you do not need to go to hospital.....but we will take you there if you want". Luckily I had covid-19 with bronchitis, mild dehydration (They added a liter of fluids to my blood), low blood salts. But was good enough to go home. Once the fevers stopped a week + into it, I still was out of breath (SPo2 in 80s) if I went to the sidewalk and got mail). Took two days for primary physician to respond and she then ordered Pneumology stat, lung function, and xrays. Took two days for pneumology to set up a "virtual appointment", and since they called on a Friday they set it up for Monday (How are they going to know my lung condition virtually I asked. Their response was I had covid so I cannot come in. I responded I am more than 10+ from covid start and clinically no fevers so am considered over the acute stage of covid itself. If I have bacterial pneumonia, etc then virtual will not help, by the time I get appointment either I will be getting better (i.e. breathing issues are acute not chronic) or I will have degraded and have to head to emergency. As it was I got better so cancelled the appointment on the day of the appointment. (Hate to think with all of their delays if I had gotten worse).
My wife who is part of the Moderna trial and was vaccinated in Mid october did not come down with symptomatic covid [But was not tested either].
Just glad to be breathing good and no longer sick. Still surprised being fully vaccinated and getting moderate to serious covid. My guess (and it is just a guess, Pfizer will not tell me what they find out about the variant I got) is I got delta.