A letter was sent by the school to parents of grade 7 children advising the children to stay home for 14 days.
They will be allowed to return on Thursday, September 24.
Almost 1,000 children attend Taunton school and all other grade groups will be allowed to continue.
In a letter to the parents of all of the grade 7 children in the school, Acting Principal Nic Blunsum said: ‘We have been informed by Public Health England that there has been only one confirmed case of Covid-19 in the 7th grade group at school.
“We followed national guidelines and identified that your child has been in close contact with the affected child. In accordance with national guidelines, we recommend that your child stay at home and self-isolate until September 23 inclusive (14 days after contact).
“Their first day back to school will be Thursday, September 24th. The advice to isolate oneself applies to all Grade 7 students attending Bishop Fox School.
“We ask you to do this to reduce the spread of Covid 19 to other members of the community.
“If your child is well at the end of the 14-day self-isolation period, he can return to his usual activities.
“Other members of your household can continue their normal activities as long as your child does not develop symptoms during the 14-day self-isolation period.”