ABSTRACT THE EFFECT OF SUN EXPOSSURE ON THE FREQUENCY OF INFLUENZA INCIDENCES IN STUDENTS OF SMAN 11 PALEMBANG ((Muhammad Rizky, Desember 2020, 95 halaman) Fakultas Kedokteran Universitas Sriwijaya Background. Sunlight produces ultraviolet B radiation that plays a role in the synthesis of vitamin D in the body. Vitamin D is known to have benefits in the process of calcium synthesis in bones and…