Here are the main headlines to emerge from today's government coronavirus briefing:

• The use of face coverings in corridors and communal areas of secondary schools is set to be introduced in Scotland

• The first minister highlights further lockdown restrictions that have been lifted across Scotland, though some don't apply to Aberdeen

• However some localised lockdown restrictions in Aberdeen have begun to be lifted
• The first minister says the cluster of 22 cases linked to Kingspark School in Dundee may turn out to include transmission within the school
• Click here to find out where school pupils tested positive in Scotland

• The first minister warns the cluster at the 2 Sisters food processing plant in Coupar Angus is expected to increase from 110 positive cases

Image source, EPA

• The first minister says she is aware of issues with the booking system for tests following "exceptional" demand for testing over the weekend
• Ms Sturgeon also defends the policy of reducing delayed discharge at the start of the pandemic and the use of revalidated PPE
• There were 66 new cases of Covid-19 in Scotland but no deaths with a positive test
• The provisional information is that 14 of the 66 new cases are in NHS Tayside where the 2 Sisters food processing plant cluster is
• A total of 15 cases are in Greater Glasgow and Clyde, 17 are in Lanarkshire and five are in Grampian

That's all from us here on the live page, please take care and stay safe.

Nicola Sturgeon ends her daily briefing by stressing again that people must follow the five pieces of advice in FACTS: They are:

• Face coverings in enclosed spaces
• Avoid crowded places
• Clean hands and surfaces regularly
• Two metre distancing; and
• Self-isolate and book a test if you have symptoms

You can find out more about the guidance at NHS Inform, external.

Image source, Getty Images

Kieran Andrews from The Times says dentists are receiving repurposed PPE with an original expiry date of 2012.

He asks if the first minister is confident that PPE that is a decade past its original expiry date is fit for purpose.

The Scottish Conservatives have called for an urgent investigation into the issue, saying dentists were issued with old PPE with stickers covering the expiry date.

Ms Sturgeon says the government is always happy to engage with individual groups of clinicians if they have concerns.

The first minister adds: "If there is PPE being used that has gone past its expiry date, it is only used when there is a process of revalidation it has undergone."

Gordon Chree also asks why there hasn't been an increase in hospital admissions that corresponds with the higher number of new cases.

The interim chief medical officer, Gregor Smith, answers, saying there has been a shift in the age groups becoming infected as the country opens up and people engage more.

He says that many more of the infections are in younger age groups, which show a different "course and pattern" in infection.

"That doesn’t mean to say that they won’t become ill – but it’s less likely than some of the older age groups," he says.

Dr Smith adds that there is no evidence in Scotland or elsewhere that the severity of the disease is changing.

STV's Gordon Chree also asks if something has "gone wrong" with the Scottish government's Covid emlimation strategy as the numbers of new coronavirus cases continue to "tick up".

Nicola Surgeon says nothing has "gone wrong" - other than the fact that Scotland is dealing with a global pandemic.

She says case numbers were always likely to rise as Scotland came out of lockdown.

"It is still our objective to supress this virus as far as we can to as close to as an elimination level as we possibly can," she says.

The first minister also emphasises that it is important to look at the positivity rate of new cases, which in Scotland is currently hovering around 1% of all tesing done.

She says that the World Health Organisation consider a rate of below 5% to indicate that an outbreak is under control.

Scottish opposition parties are calling for an immediate start to an inquiry into why patients who have tested positive for coronavirus were discharged to care homes.

A report in the Sunday Post, external showed a leaked letter from Health Secretary Jeane Freeman talking about the pressure put on hospitals to send elderly patients into care homes in the weeks before and after lockdown.

Image source, PA Media

Donald Cameron, the Scottish Conservative's spokesman on health, told BBC Radio Scotland there needed to be a public inquiry now.

"It's highly worrying," he said.

"Partly because Nicola Sturgeon and Jeane Freeman spent most of last week denying any responsibility for the decision to send patients from hospitals into care homes, they said they were the decisions of individual clinicians.

"And now we learn from this letter it was government policy that drove this and the letter shows that health boards and hospitals were put under considerable pressure."

Mr Cameron insisted this was government policy and was a "policy in our view that was fraught with risk".

Simon Johnson from The Daily Telegraph turns to The Sunday Post story which showed a leaked letter from the health secretary talking about pressure put on hospitals to discharge elderly patients to care homes.

The first minister insists there is no contradiction whatsoever between the policy position of reducing delayed discharges and the position that was encapsulated in guidance from March this year.

She said that for any individual being discharged to a care home there must be a clinical risk assessment, she explains.

Ms Sturgeon says reducing delayed discharge of the elderly has been a goal for years and years.

She points out the health secretary was clear at the start of the pandemic that reducing delayed discharge was a priority.

Image source, Getty Images

There's a growing move towards the wearing of face coverings in the country's secondary schools.

It follows fresh guidance from the World Health Organisation that children over 12 should wear masks.

At James Gillespie's in Edinburgh face coverings will be required when moving between classes.

At Grantown Grammar in Strathspey and Millburn Academy in Inverness, they will also be needed in social areas.

Dr David Nabarro, a special envoy on Covid-19 for the WHO, told Radio Scotland it was not just about protecting the children themselves: "It's about protecting the adults in the homes where the children live, so that's family members

"And it's also about the people who care for children in Schools and trying to maintain their good health and wellbing too.

"All made slightly difficult because there are still quite a lot of unknowns about the role that children play in spreading this disease."

Gordon Chree, from STV, asks if the first minister has any more detail on the increased demand for testing over the weekend.

Nicola Sturgeon replies that health officials are still working to "properly understand" that, but says she has heard anecdotes of parents seeking tests for children with coughs that turn out not to be Covid-19.

"We’re going into a part of the year when people could have other illnesses and viruses that present with similar symptoms to Covid," she says.

"So we would expect to see demand for testing increase as we go into the autumn and winter."

The first minister says the government is continuing to "build resilience" of the testing system as we enter the next period of the pandemic.

Image source, Getty Images

Conor Matchett from The Scotsman asks if the first minister is confident that a more people get colds and students return that the testing capacity of Scotland can cope.

"That is what we are working to ensure," replies Ms Sturgeon.

She explains capacity has been increased substantially and the capacity and resilience of the system will continue to be expanded.

"We are building a capacity to deal with what we face later in the year", the first minister stresses.

Phil McDonald from Global turns to the outbreak at Kingspark School in Dundee.

He asks if the first minister stands by the position that there is no evidence of transmission in schools.

The first minister replies: "Thus far in terms of cases associated with schools, that we have been reporting, most of that is transmission in the community that is impacting on schools.

"I have never said that there will not ever be transmission in schools and it may be in Kingspark we see some of that."

She points out there is risk of transmission in schools but adds the risk is greater of community transmission getting into schools.

However there must be the right mitigations in schools which is why the guidance on face coverings in schools will be updated.

Jamie McIvor says BBC Scotland has heard that some people have had difficulties accessing tests over the weekend and asks if there has been a problem.

Nicola Sturgeon answers that she is aware of issues with the booking system following "exceptional" demand for testing over the weekend.

The first minister says there are some UK-wide problems as well, and understands that some people in Scotland were directed "erroneously" to testing centres in England.

Ms Sturgeon adds: “I would say to people that our testing system is obviously working – it’s working well, but as demand inreases, or at periods of high demand, bear with us as we resolve and understand any particular issues.”

Jamie McIvor from BBC Scotland asks the first minister whether stricter guidance on the use of face masks in schools should have been in place when pupils began returning on 11 August.

Nicola Sturgeon answers that guidance on a whole range of issues around the pandemic has been changing frequently over the last few months.

"When we change guidance in light of later scientific evidence understandably... there will be people who say we should have done it earlier," she said.

"But we are trying to make sure that all of our guidance is properly considered, informed by the best evidence we had, but also adaptable."

The first minister said there had been updated guidance over the weekend from the World Health Organisation on the use of face coverings in schools.

She added that the Scottish government was always working to find a balance between being as up-to-date as possible, responsive and proportionate.

Image source, Getty Images

The first minister says over the weekend the World Health Organisation (WHO) has issued fresh guidance saying children over the age of 12 should wear masks.

Ms Sturgeon confirms the education secretary is in the final stages of consulting with teachers and education authorities on a recommendation for the use of face coverings in secondary schools.

This would be for staff and pupils when they are moving around in communal areas like corridors.

She explains this is being consulted on because mixing of different groups is more likely in this area, as is crowding and a lack of sufficient ventilation.

The first minister tells the briefing the government will go slightly beyond WHO guidance.

She adds the position on school transport is being considered but the use of face coverings in school class rooms is not being consulted on.

That's because there is more scope for physical distancing in the classroom, but where there are outbreaks this could be an option she explains.

The first minister turns to the cluster at Kingspark School in Dundee where there are 22 cases in total, the majority staff.

Ms Sturgeon says children from two other Dundee schools have tested positive.

She stresses pupils and staff must stick to the self-isolating guidance they have received.

Image source, Google

The first minister turns to the cluster around 2 Sisters food processing plant in Coupar Angus.

Ms Sturgeon points out that as of yesterday there were 110 positive case linked to that cluster.

A total of 96 were employees of the factory and 14 were contacts.

She expects to see the number of cases rise further in this significant outbreak.

The first minister stresses if anyone works at the plant they and their families must self-isolate until 31 August.