Covid-19 testing is continuing at two schools in Nenagh, Co Tipperary, following an outbreak of the virus.
Management at St Joseph's CBS took the decision to close the school following the detection of multiple positive cases amongst senior cycle years.
There are 570 pupils in the school and it is reported that 5th and 6th year students were offered tests earlier this week and asked to self-isolate.
All staff at the school were tested and a number of positive cases were also detected.
The Health Service Executive is currently engaging with a second school in Nenagh, where there have been a number of positive cases detected.
A public health risk assessment is taking place at St Mary's Secondary School, which remains open to students and staff who are not deemed close contacts.
President of the Association of Secondary Teachers, Ireland, Ann Piggott said these outbreaks were worrying in the run up to the Leaving Certificate and there was concern that students may be coming into school with no symptoms but transmitting the virus to others.