Teachers have racked up nearly twice as many sick days as normal, with some schools having already overspent their relief budgets.
Principals say extra government funding for Covid-related sick leave is hard to apply for and doesn't cover other illnesses such as colds and flu.
Some say more support is needed from government to get schools through this years difficult cold and flu season, compounded by Covid-19.
Post Primary Teachers Association president Melanie Webber.