Covid-19 is impossible to eradicate as it spreads through animals, forget that idea. Pfizer themselves have performed studies that show immunity declining. I d

Covid-19 is impossible to eradicate as it spreads through animals, forget that idea. Pfizer themselves have performed studies that show immunity declining. I do know that they tell from the levels of antibodies seen in blood but I don’t know if the effect of variants has been measured (if it can be measured at all without unethical experiments).