UCU Scotland accuses principals of 'blaming students' for Covid outbreaks after 'encouraging' them back to campuses.
The island of Curacao has also been added to the list of countries from where returning travellers must self-isolate.
A new job support scheme will see the Treasury help employers cover the full-time wages of people working 'viable' jobs.
Nicola Sturgeon told the STV News at Six the country must 'come together again' in the fight against Covid.
Another two people have died with the virus in Scotland while 486 new infections have been confirmed.
The First Minister warned Scots they 'simply cannot have 100% normality' in the global Covid pandemic.
Nicola Sturgeon said she hopes to attend a Cobra meeting with Boris Johnson over the weekend.
Another Covid-19 death in Scotland as the country confirms more than 200 new cases for the fourth day running.
It's the highest number of daily infections in the country since May 1, and is 4% of newly-tested Scots.
The Protect Scotland app has already told more than 100 Scots to self-isolate, Nicola Sturgeon revealed.
Second day of exactly 267 new infections which amounts to 3.6% of newly-tested Scots.
The SQA plans to run a full diet of exams next spring but is preparing contingencies, John Swinney said.
Nicola Sturgeon said the measures in five council areas are 'helping to slow down the increase' in cases.
One person with Covid-19 has died in the last 24 hours, while Scotland has logged the most daily infections since May 6.
The First Minister said there were 'serious concerns' over a growing number of unfinished tests.
People living in North and South Lanarkshire will no longer be able to host or visit other households.
Nicola Sturgeon said rising cases in the Lanarkshire region are of 'particular concern' to the government.
Holidaymakers coming back Hungary and La Réunion will have to self-isolate from 4am on Saturday.
Nicola Sturgeon said there are 161 new cases of coronavirus in Scotland, 1.9% of newly-tested people.
From April to June, total deaths in Scotland were around a third higher than usual - around 4500 excess deaths.