Students and teachers have been told to self-isolate at home after a number of people have tested positive for Covid-19.
Garth Hill College in Bracknell will be closed until Tuesday, December 8 and pupils have been told to learn from home.
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From Wednesday next week, the school will open only to students in years 12 and 13 unless they have been told to self-isolate, in addition to children of key workers and vulnerable children.
The council confirmed that all close contacts have been identified and have been told to self-isolate.
Students in other year groups should continue to learn remotely at home.
Additionally, due to a positive case at Rise@GHC in Eastern Road, the setting closed yesterday for all pupils and will remain closed today (Friday).
A spokesman at Bracknell Forest Council, said: "The school will continue to monitor the situation and will update again when there is information on when it will be able to open to other year groups.
"These are not a decisions the school has taken lightly; they have been made in the best interest of keeping all staff and pupils as safe as possible.
"Given the number of staff self-isolating it is not possible to open the school safely and in line with teacher/ pupil supervision ratios."
Parents have been provided with information on what to do should their child develop symptoms of COVID-19, what symptoms to look out for and how to prevent the virus spreading.
More information can be found on the NHS website.
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