Thornhill College shut last week after rise in Coronavirus cases
And Derry had the second highest number of cases after Belfast.
Thornhill College in Derry had to shut its doors to pupils and staff last week for a deep clean after a spike in cases.
That is according to new figures published by the Public Health Agency (PHA).
The PHA has been informed of 2,030 positive Covid cases in schools since teaching returned at the beginning of term.
There had been 608 Covid-19 so-called incidents in 519 schools up until 20 October, said the agency.
An incident can be a single positive case, a cluster of two to five cases or more than five cases.
A cluster is defined by the PHA as two or more laboratory-confirmed cases of Covid-19 among individuals in one setting, such as a school.
This is the first time the agency has reported the number of Covid cases specifically in schools.
The figures from the PHA detail the number of cases in schools from the start of term in late August up until Tuesday.
They show that:
302 schools had a single positive case – 228 primaries, 59 post-primaries and 15 special schools
237 schools had a cluster of two to five cases – 136 primaries, 88 post-primaries and 13 special schools
Sixty nine schools had a cluster of more than five cases – nine primaries, 55 post-primaries and five special schools
A school can have more than one Covid “incident”- for instance, it could have two separate cases or clusters that are not linked to each other.
Overall, 86% of post-primary schools had at least one case since the start of term, compared to around 40% of primary schools and 66% of special schools.
Around three-quarters of schools (76%) in the Belfast City Council area have been affected by positive cases.
That local government district had the highest proportion of schools affected, just higher than the numbers recorded in Derry and Strabane – the district with the second highest proportion.
Of school cases notified to the PHA, just over two-thirds (68%) were pupils and one-third (32%) were staff.
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