Every employer liable to pay compensation under the provisions of this chapter shall keep a record of all injuries, fatal or otherwise, sustained by his or her employees in the course of their employment and shall report such an injury causing an absence of one day or more, or necessitating medical attendance, to the Commissioner in writing upon forms to be procured from him or her for such purpose within 72 hours, Sundays and legal holidays excluded, after the occurrence of such an injury. At the termination of the disability of such injured employee, such employer shall make a final report upon forms to be procured as herein provided. If such disability extends beyond a period of 60 days, at the expiration of each 60-day period, such employer shall make a supplemental report to the Commissioner that such injured employee is still disabled and, at the termination of such disability, shall file a final report as provided in this section.