Not sure this is fully up to date but these links show that the mutation is in at least 11 countries.
https://github.com/emmahodcroft/cluster_scripts/blob/master/README.md
https://github.com/emmahodcroft/cluster_scripts/blob/master/cluster_tables/S.N501_table.md
Edit: Good explainer on N501 sequence here:
https://twitter.com/firefoxx66/status/1338533710178775047?lang=en-gb
China recorded in 2013?
Its as clear as mud isn't it? The Twitter link I posted above explains some of it.
I think N501 is just one part of the mutation in this strain.
In any case, its been in the UK since September and people have been travelling to the EU so it still remains unlikely that its isolated here.
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Not sure this is fully up to date but these links show that the mutation is in at least 11 countries.
https://github.com/emmahodcroft/cluster_scripts/blob/master/README.md
https://github.com/emmahodcroft/cluster_scripts/blob/master/cluster_tables/S.N501_table.md
Edit: Good explainer on N501 sequence here:
https://twitter.com/firefoxx66/status/1338533710178775047?lang=en-gb