Moving parts of Scotland in Level 2 of coronavirus restrictions with high case rates to higher levels would be “difficult”, a public health expert has said.

Linda Bauld, professor of public health at the University of Edinburgh, said that restriction easing in Glasgow had stalled as a result of the rising cases. 

She told BBC Radio Scotland’s Good Morning Scotland programme the decision to keep Glasgow in Level 3 was due to concern about whether rising cases are leading to more people in hospital.

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She said: “They are just hanging on a little bit longer to make sure they can be confident that cases are not translating to more people in hospital.

“In contrast, there are worrying signs in parts of Edinburgh – Silverknowes and Davidson’s Mains.

“In Renfrewshire and Midlothian there are high cases but because they are already in Level 2 to then reverse that, policy-wise, would be more difficult.”

First Minister Nicola Sturgeon announced on Friday that Glasgow would remain at the higher level for at least another week due to an “uncomfortably high” level of cases amid an outbreak driven by the Indian variant of the virus.

She said a decision would be made by Wednesday at the latest on whether the city can move to Level 2 next Saturday.

People in the city are not able to meet other households indoors in their homes and there are stricter restrictions on hospitality, including a ban on selling alcohol indoors.

Non-essential travel in and out of the city is prohibited.

Stephen Reicher from the University of St Andrews and a member of the Sage sub-committee advising on behavioural science insisted that caution is the correct approach over the Glasgow outbreak.

He said: “We’ll find out within a week or two exactly how serious it is. If it’s very bad, we’ll learn in a week or so. If it’s bad, we’ll learn in a couple of weeks.

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“I think it’s worth pausing for a moment or two rather than to have to face the possibility of going back to the really dark days of January and February.”

He added: “Hospitalisations are going up at moment, we’re not yet seeing increases in people at intensive care units and thankfully we’re not seeing deaths yet.

“The real danger is if you wait until you’re certain then the difficulty is it might be too late, you might have reseeded this variant and we might then inevitably in two or three weeks’ time see the terrible statistics in ICUs and deaths going up.”

Health Secretary Humza Yousaf said there was “significant community transmission” of coronavirus in the Glasgow hotspots.

The city will remain under Level 3 of Scotland’s restrictions until at least June 5 and Mr Yousaf said urgent work was being carried out to understand the outbreak in south Glasgow and how the Indian variant arrived.

He told BBC Radio 4’s Today: “In a few concentrated hotspots… we are seeing significant community transmission.

“The levels and the numbers of cases are continuing to rise.”

In other parts of the country “local health teams tell us they are relatively contained outbreaks” linked to either schools or domestic clusters, but that was not the case in Glasgow.

“What we are seeing is it’s coming in in areas where there is a large, diverse community so therefore there is a probability the variant has come in from international travel.

“Therefore we are trying to get to the bottom of how it managed to get in.”