In an open letter to the health minister about the tension over its introduction, the union says 86 per cent of teachers disapprove of the measure. Only 12 percent accept the certificate, and if it becomes mandatory, it will not only block the learning process, but will also lead to an outflow of teachers. This will also create huge difficulties for Bulgarian parents. 

In the absence of a dialogue with the ministry on the case, the union says it is ready to respond by all possible means, including protests and strikes.