Children in Year 7 will now have to learn from home after the positive tests at Merchants Academy, which were confirmed on Monday (June 28).
Head of Secondary, Vicki Starkie, said in a letter to parents: “As you know, we have put extensive measures in place to ensure that our students and staff are as safe as possible as we have welcomed our young people back to school.
“It is a reminder that we all need to remain vigilant, both in school and in the wider community.
“We are continuing to monitor the situation and are working closely with Public Health England.
“This letter is to inform you of the current situation and provide advice on how to support your child; please be assured that we will keep in regular contact.
“The academy remains open to students in all year groups except for students identified as direct close contact and, providing your child remains well, they can continue to attend school as normal.
“We will keep this under review.”
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More than 65 schools have been partially closed after confirmed coronavirus cases across the city.
The closures come as cases in Bristol have been rising in recent weeks.
In the week ending June 18, 766 Covid cases were confirmed – this compares to 180 in the week ending June 4.
And mayor Marvin Rees has warned the city was now at a “critical point” in the pandemic.
“The number has almost doubled since last week and is higher than England’s infection rate of 90 cases per 100,000,” the mayor said.
“To date, 259,547 – 60 per cent – of all adult Bristol residents aged over 16 have had at least one vaccine dose.”