A Covid vaccine that can protect against multiple variants is being hailed as a "holy grail" jab.
Researchers say they have made a "promising" breakthrough in developing the vaccine that could target multiple variants including original strains Alpha, Beta, Delta, the first Omicron variant and two bat coronaviruses.
Scientists at the Francis Crick Institute believe they found a genetic feature of the Covid-19 virus that appeared "similar" to a number of coronaviruses that are less prone to mutations.
