Teachers have called for the SNP Government to introduce blended learning or reduce term times to boost Covid safety in schools.
Classrooms across Scotland have been open full-time since August but some staff have raised concerns over whether enough is being done to stop the spread of coronavirus.
The country's biggest teaching union has now published the results of a survey it carried out among members as its ramps up pressure on SNP ministers over the issue.
The need to keep classrooms well-ventilated even in winter was raised by several teachers, who are worried about being forced to choose between following safety rules and keeping pupils warm.
One teacher called for blended learning, which would see pupils attending school on a part-time basis when not working from home, to ensure two metre social distancing could be enforced.
They said: "Blended learning is my preferred option so that a two metre social distance can be maintained and children's learning can continue.
"An earlier finish to the term may help reduce the transmission.”
Another teacher said: "I feel very unsafe in my place of work - even although all protocols and guidance have been followed by staff, we have had an exceptionally high number of staff positive with Covid within the last week.
"I feel unsafe as it is still being classed as not transmitted within the school; I strongly disagree with this. I also feel that parents have not been well informed of the extent of the spread of Covid within our school."
EIS general secretary Larry Flanagan said: “Scotland’s teachers are working in environments that many do not believe to be safe enough, and this is having a serious impact on their mental health and wellbeing.
"The political decision taken by the Scottish Government to keep schools open at all costs, even in areas which are subject to level four restrictions, is wholly inconsistent with other steps being taken to drive down infection."
The union boss added: "The Scottish Government’s rejection of remote or blended learning for schools in areas with high rates of infection has increased the level of risk for pupils, teachers and their families.
"It is time for the Scottish Government to rethink this damaging policy, with the danger of increasing rates of community infection throughout the winter months.”
The Record has asked the Scottish Government for comment.
