An outbreak of sickness at Brentwood School led to the Health Protection Agency getting involved.
Several parents contacted the Gazette on Friday about an outbreak with one reporting students and teachers were "dropping like flies".
A spokeswoman for the school said: "Brentwood School is taking advice from the Health Protection Agency following an outbreak of sickness in the School.
"Fewer than one per cent of pupils in the senior school have been sent home through illness. The school has 1100 pupils on roll.
"The school has not found it necessary to bring in any supply staff."
Headmaster Ian Davies said: "More pupils than normal were absent from school today because of a 12-hour sickness bug.
"However, I am delighted to report that the overwhelming majority of staff and pupils have been unaffected."
Do you have any more information or was your child affected? If so, please contact the Gazette in the comments below or by emailing editorial@gazettenews.co.uk.
Several parents contacted the Gazette on Friday about an outbreak with one reporting students and teachers were "dropping like flies".
A spokeswoman for the school said: "Brentwood School is taking advice from the Health Protection Agency following an outbreak of sickness in the School.
"Fewer than one per cent of pupils in the senior school have been sent home through illness. The school has 1100 pupils on roll.
"The school has not found it necessary to bring in any supply staff."
Headmaster Ian Davies said: "More pupils than normal were absent from school today because of a 12-hour sickness bug.
"However, I am delighted to report that the overwhelming majority of staff and pupils have been unaffected."
Do you have any more information or was your child affected? If so, please contact the Gazette in the comments below or by emailing editorial@gazettenews.co.uk.
