Cases of the new variant of Covid-19 have been confirmed in several European countries, including Canada and Japan.
“The new variant is considerably more transmissible than previous strains but not necessarily any more dangerous for those infected,” experts say.
The new variant which is linked to people who arrived from the UK was also reported in Spain, Switzerland, Sweden and France.
Japan is to ban most non-resident foreign nationals from entering the country for a month from Monday.
Since reporting infections in five passengers who had all arrived from the UK, the country has confirmed two more cases, one of which is said to have been domestically transmitted.