Scotland's health secretary has said people should act as if the new Covid variant Omicron is "already here" after two cases were detected in England.
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The UK Health Security Agency has confirmed cases in Chelmsford, Essex, and in Nottingham.
Humza Yousaf said it was a "stark reminder that we must not drop our guard".
He said the Scottish government would do "everything we can to minimise the risk of spreading infection".
First Minister Nicola Sturgeon tweeted that "we all have a part to play in beating this new threat".
UK Health Secretary Sajid Javid said earlier the cases were linked to travel in southern Africa and they and their households were self-isolating while more tests and contact tracing took place.
Following a meeting with Mr Javid and the other devolved administrations, Mr Yousaf said Scotland had agreed to align with new UK travel restrictions.
Fully vaccinated arrivals will need to take a PCR test within two days and to self-isolate until a negative result is received.
Scotland "reserves the right to go further if necessary", Mr Yousaf said.
"No cases have yet been detected in Scotland, but the fact this new variant is on our doorstep is clearly a worry and we should act as though it is already here," he said.
Four more African countries - Angola, Mozambique, Zambia and Malawi - will be added to Scotland's red list of high risk countries from 04:00 on Sunday.
The new Omicron variant was first reported to the World Health Organization from South Africa on Wednesday and has also been identified in Botswana, Belgium, Hong Kong and Israel.