Scots could catch the South African variant of coronavirus, even if they've already had Covid-19, one professor claims.
Linda Bauld is professor of public health at the University of Edinburgh.
She said that with the risk of infection, more focus should be put on self-isolating.
She told BBC Breakfast: "That is something that is causing concern around the world.
"In Brazil where there is a different variant - which was badly hit in the first wave - there was a lot of reinfection there and that's what also seems to potentially be the case with this variant in South Africa.
"South Africa is a country that has really struggled during this pandemic and we have had rates on reinfection there.
"If someone in the UK has been infected with Sars-CoV-2 and become unwell with Covid-19 in the past, it might be potentially, if they come into contact with this variant, they may become unwell again.
"That's why it's really important to do this surge testing and try and find the cases and support people to self-isolate."
On the prospect of tougher border controls she said: "I think what the Scottish Government would like to do is take an approach similar to other countries where effectively a quarantine is applied to almost everybody coming in from overseas.
"What I would be prefer to be called 'supported quarantines' where people are adequately supported in a hotel or elsewhere and checked up on regularly.
"The UK Government's suggestion is that will only be from certain countries and the details of that are still not clear.
"The reality is that people won't necessarily travel directly - so even if you're saying people from South Africa have to quarantine, someone from South Africa might come via somewhere else."
She said that it would be "quite tricky" for Scotland to impose strict quarantine rules "unless the UK does this in a co-ordinated way".
