Education Secretary Gavin Williamson has said the government was being guided by the simplest science because it accelerated plans to reopen schools to all or any pupils in England next month.
Government advisers have warned the state may have reached the limit of what are often reopened in society safely.
His comments come after Prime Minister Boris Johnson said the reopening of faculties – after months with in-person education – was the “national priority” of the government.
The prime minister, who visited a faculty in East London on Monday, is known to possess made it clear that schools should shut last in any future local lockdowns – after businesses including shops and pubs.
The current plan is for many children across the country to be back in school by next month.
Guidance on reopening schools has been published for England. There also are separate plans for Wales, Northern Ireland and Scotland, where schools are scheduled to return from Tuesday.
Schools across the Uni0ted kingdom closed on 20 March, except to children of key workers or vulnerable children.