And the Government took an ultra-cautious approach in deciding to only open primary schools gradually from June 1, the papers will show.
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The findings in the Sage scientific papers come amid a massive row over whether it’s safe to send England back to school.
A whopping 10.6 million people – a third of all workers – are ‘key workers’ across the UK, according to the Office for National Statistics.
This includes NHS and social care staff, but also an army of other workers including bus and train drivers, supermarket staff, police and some council staff.
Hardline union bosses have waged war on the reopening plan – which they have claimed could cost lives.
Scientists looked at various models for return to schools
They have demanded the Sage papers are published before teachers could consider heading back to work.
But the hotly anticipated advice – which goes online on Friday afternoon – is expected to deal a blow to unions by saying schools can reopen safely.
The Sun understands the Sage documents will find teachers will be at no greater risk of catching the virus than any other key workers.
They will show scientists looked at various models for a return to schools, including different year groups and pupil numbers.
And ministers adopted a cautious approach by proposing to only open primaries gradually, beginning with reception, Year 1 and Year 6.