A child at Bexhill Academy is isolating at home after having shown “clear symptoms” of Covid-19.
The school was alerted by Public Health England that there may be a confirmed case but will remain open.
In a letter to parents, Catherine Davies, the executive principal, said it was an unusual case.
“The child has attended A&E and has shown clear symptoms that the hospital identified as potentially Covid,” she wrote. “The child is awaiting the results of the test.”
The school has written to children who had been in direct prolonged contact with the pupil, instructing them to isolate at home for 14 days.
“We have been instructed to assume that the child with Covid symptoms has Covid until the results of the test indicate otherwise,” she added.
Ms Davies also reassured parents that coronavirus was a mild illness for most people.
“We know that you may find this concerning but we are continuing to monitor the situation and are working closely with Public Health England,” she added.