We investigate the potential for reactivation to restore infectivity to UV-damaged bacteriophage 2MPempty set isolated from wastewater. The virus belongs to the Myoviridae family of the tailed phages. This Phage was chosen for detailed analysis, and was inspected by electron microscopy, host range determination. In addition, we explore the dynamics of bacteriophage host interactions in different conditions of UV-C irradiation. The inactivation kinetic or dose-response relationship was described by the method of plaque-forming ability. The UV-inactivation kinetic was represented in the exponential curve according to the model of Chick-Watson and Series-event kinetic model. In a 99.99% inactivation of 2MPempty set bacteriophage which corresponded to 720 mW s/cm(2) of UV-dose, high correlation was observed between the loss of infectivity and the increase of UV-C dose. The restore of infectivity of UV-exposed bacteriophage was also determined under conditions which either activated or repressed the light-dependent photolyase enzyme in host cells, in order to examine the damage-dependent response of this bacterial repair system. The results of reactivation indicated that light-dependent repair (photoreactivation) was much more efficient than dark repair in restoring infectivity to bacteriophage damaged by UV-C radiation.