You may have caught one of the new strains of Covid circulating this autumn (of which I am one, currently typing this). Experts say these do not appear to pose any bigger threat than previous types of Covid or make people feel more ill. It seems like #Covid is back in the air but nobody gives attention to. One user on X, formerly known as Twitter, said today: "I swear Covid is back in the air. When the changes become significantly different, the new virus types are known as variants.