The latest government advice on COVID-19 includes specific advice for children and young people about when to stay at home and when they can return to education, as follows:
"Children and young people with mild symptoms such as a runny nose, sore throat, or slight cough, who are otherwise well, can continue to attend their education setting. Children and young people who are unwell and have a high temperature should stay at home and avoid contact with other people, where they can. They can go back to school, college or childcare, and resume normal activities when they no longer have a high temperature and they are well enough to attend.
All children and young people with respiratory symptoms should be encouraged to cover their mouth and nose with a disposable tissue when coughing and/or sneezing and to wash their hands after using or disposing of tissues.
It can be difficult to know when to seek help if your child is unwell. If you are worried about your child, especially if they are aged under 2 years old, then you should seek medical help."
There is also specific advice on testing of children and young people aged 18 and under:
"It is not recommended that children and young people are tested for COVID-19 unless directed to by a health professional.
If a child or young person has a positive COVID-19 test result they should try to stay at home and avoid contact with other people for 3 days after the day they took the test, if they can. After 3 days, if they feel well and do not have a high temperature, the risk of passing the infection on to others is much lower. This is because children and young people tend to be infectious to other people for less time than adults.
Children and young people who usually go to school, college or childcare and who live with someone who has a positive COVID-19 test result should continue to attend as normal."