24 Pa. Stat. § 11-1153
When a board of school directors is compelled to close any school or schools on account of contagious disease, the destruction or damage of the school building by fire or other causes, the school district shall be liable for the salaries of the teachers of said school or schools for the terms for which they were engaged. Whenever a teacher is prevented from following his or her occupation as a teacher, during any period of the school term, for any of the reasons in this section specified, the school district shall be liable for the salary of such teacher for such period, at the rate of compensation stipulated in the contract between the district and the teacher, in addition to the time actually occupied in teaching by such teacher.
Whenever a teacher is prevented by sickness or some other unavoidable circumstance from following his or her occupation, the school district may, at the discretion of the directors, make such payments of compensation during the period of absence from duty as the exigencies of the case may seem to warrant. In the case of sickness, no payments shall be made unless the teacher shall have furnished to the board of school directors a certificate from a physician stating the nature of the sickness and certifying that he or she was unable to perform duties as a teacher.
24 P.S. § 11-1153