It shall be the duty of the principal or other person in charge of any public, private or Sunday School to exclude therefrom any child or other person affected with a disease presumably communicable, until the expiration of the prescribed period of isolation for the particular communicable disease. If the attending physician, school physician, or health officer finds upon examination that the person is not suffering from a communicable disease, he may submit a certificate to this effect to the school authority who shall readmit the person.