There is a concern that some students waiting on a COVID-19 test result are not being sent home from school.
ASTI President Ann Piggott says they have been contacted by one such school which is concerned about a case, but that nobody else has been sent home.
She told Pat Kenny there are concerns some schools are continuing as normal, despite a confirmed case of the virus.
"We're glad that students have a chance to be educated again and they're back at school with their friends and their social skills are improving.
"But there are certain instances that we're certainly very worried about - and some of them we have raised in your programme over the past few weeks, which have achieved results.
"But this morning there's a really worrying case of schools who are continuing as normal, despite the fact that there have been confirmed cases within those schools".
"There have been some other cases now over the past week or two, and in some instances a whole class has been sent home.
"So that's probably easier to achieve in a primary school - in second-level schools it's far more complicated in that students are in their base room, but then they're moving around to do options.
"A school has been in touch with us because they're really concerned about a case, and yet it doesn't seem like anybody else has been sent home.
"There is a guideline for schools to deal with an outbreak, and that involves sending the suspected case to the isolation areas and then the HSE will step in.
"They will look at each case on an individual basis and they will contact parents or teachers if relevant.
"So the problem is I suppose at the moment is a case might be suspected, and until that case is confirmed nobody else will be told - which is understandable.
"It mightn't be a case at all, it might be something else - it might be hay fever or something.
"But also the problem is it might take up to 48 hours or 72 hours until the test is done - and at that point then close contacts will have to be informed.
"And those contacts then will have to tested, and that will take another 48 or 72 hours, so you can see the problem then - in that several cases might take up to a week.
"And meanwhile you have other students and teachers in contact with the teachers or student involved".
