Summerhill Primary Academy sent a letter to parents on Tuesday which says a staff member in Year 5 has tested positive for Covid-19.
It comes after the school previously confirmed a Year 4 pupil tested positive, and a number of other pupils had to self-isolate.
The more recent letter says: "We have been advised that there has been a confirmed case of Covid-19 within a member of staff within Year 5.
More Covid-19 coverage:
"We have carried out a full risk assessment and identified all those who have been in close contact with the affected case and have recommended that they stay at home and self-isolate until 14 days after their last contact.
"Your child has not been identified as a close contact and therefore does not need to make any change to their usual routine, including school attendance.
"The most common symptoms of Covid-19 are recent onset of a new continuous cough and/or a high temperature and/or a loss of, or change in, normal sense of taste or smell (anosmia).
"If your child, or anyone in your household, develops these symptoms, you whole household must remain at home and not go to work, school or public areas.
"You should arrange testing for the person who has developed symptoms. When the result is known further advice will be available."