Hundreds of people have been affected by a new "stealth variant" of Covid - and experts have warned it could spread even faster than Omicron.
Already 426 cases of the sub-variant of Omicron have been discovered across England to date, reports WalesOnline.
Research so far shows it looks like it is spreading faster than its parent but it is also harder to identify which has led some experts to dub it a "stealth variant".
