Why do unmarried female students need to apply for health certificates for kindergarten teachers' internship?

All teachers are required to have a physical examination and health certificate before entering the post, especially kindergarten teachers. People who come into contact with young children must be free from any infectious diseases. Nowadays, families pay more and more attention to children's enlightenment education, so the requirements for kindergarten teachers' posts are gradually improving. But the current situation is the explosive growth of kindergartens, and the number of kindergarten teachers is increasing day by day, which leads some young girls who have no skills to become kindergarten teachers, but they must be healthy anyway.