Got my Pfizer booster today. I was informed about the new Deltra-cron strain that seems to be doing the rounds lately, and is easily as bad as the original strain (Alpha), and the Pfizer/Moderna are the most effective at neutralising the virus though it varies from 75 to 90%, that's for symptomatic infections, it will more or less eliminate any chance of ending up in ICU or dead, so there's that. Delta-cron is much more dangerous than Omicron, but not quite as dangerous as Delta, and more along the lines of the original strain. Apparently Omicron is no worse than the flu, but Deltra-cron could literally kill millions. That's the one to watch out for as I've been informed by some nurses and a doctor who was there when I got the booster. Delta-cron even if you are asymptomatic it apparently can cause lung, kidney, liver, heart problems, and labyrinithitis/hearing damage/tinnitus, as well as long term fatigue that might be very difficult to recover from. Made my decision easy.