The Association of Secondary Teachers, Ireland (ASTI) has raised concerns about pregnant teachers returning to classrooms with large numbers of unvaccinated or partially vaccinated students.
Pregnant women between 14 and 36 weeks have been offered an mRNA Covid-19 vaccine, but some teachers in the earlier stages of pregnancy have expressed concerns about being in classrooms with unvaccinated students.
Kieran Christie, the General Secretary of the ASTI, said pregnant teachers who have been in contact with the union are "incredibly stressed out" about the situation.
Speaking on RTÉ's Morning Ireland, Mr Christie said this should be a wonderful period of their lives but they are "very upset" and "losing sleep".