Children are "very minor players" in the transmission of coronavirus and opening schools would "add little" to the reproduction rate of infection, a leading expert has said.

Professor Russell Viner, president of the Royal College of Paediatrics and Child Health and a member of the Government's Sage scientific advisory group, said that "reopening schools is one of the least risky things we can do".

His comments were echoed by Education Secretary Gavin Williamson, who said there was little evidence of transmission in schools.

However, teachers, scientists, opposition politicians and the children's commissioner for England Anne Longfield have all called for improvements to testing before pupils return.

Prime Minister Boris Johnson has said it is the "national priority" to get children back in class in England next month, but he has been warned by scientific advisers that "trade-offs" may be necessary to keep transmission down.

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Ms Longfield welcomed Mr Johnson's commitment to make children the priority after previously accusing ministers of treating them as "an afterthought".

But she said regular testing of pupils and teachers, perhaps as frequently as weekly, could be needed even if they do not exhibit symptoms to keep transmission rates down.

Prof Viner said that while children can and do transmit this virus they are "very minor players in the transmission overall".

He added: "We cannot be in a risk-free society and this is about the risk balance.

"What is the risk balance equation and I think that's separate for children and young people themselves.

"It's very clear for them the benefits and risks, the balance is for them to be back at school.

"For broader society, look, I think it's also clear that re-opening schools is one of the least risky things we can do.

"Anything we do that reopens society will add a small or a larger amount to the overall population reproductive number and for schools we believe that it's a relatively minor player, it would add little to the overall population R."

In a statement Mr Williamson said the Government will continue to be guided by the "best scientific and medical advice".

He added: "The education and care of our children is a national priority.

"We have always been and will continue to be guided by the best scientific and medical advice.

"The latest research which is expected to be published later this year - one of the largest studies on the coronavirus in schools in the world - makes it clear there is little evidence that the virus is transmitted at school."