Those youngsters affected are being taught remotely from their homes until they return to school on Tuesday.
Executive headteacher, Christine Stansfield, has written to parents to explain the situation.
She says in the letter: “Regrettably, a member of the school’s teaching team has received a positive test result for COVID-19.
“This is classified as a single case.
“The school has taken Public Health advice and, as a precaution, we believe it appropriate and reasonable, that three classes from different year groups, taught by the identified staff member, should now self-isolate.”
Any siblings of the affected students are still attending school, unless they or a household member show symptoms.
Mrs Stansfield writes: “The school takes the safety of its students extremely seriously and I am thankful to those parents and guardians who have been contacted, and are fully understanding of the decision made.
“Students who are self-isolating for whatever reason, should continue to learn using our remote learning platform – ‘Microsoft Teams’.”
She adds: “Keeping our children and families, staff and local community safe is our priority.
“It is vital that we follow government guidance and the advice from Public Health England and our Local Health Protection Team.
“Whilst we are disappointed for the member of staff and for those who are now having to self-isolate, I want to assure all parents and guardians and students that the school remains safe, and continues to be open as normal.
“We are in extraordinary times and I wish to thank all parents and guardians for their support.”
Any parents who want further information on the situation are advised to email [email protected] to discuss it further.