<prompt> All of the following conditions result in chronic thick walled pyogenic abscess except: March 2005Inadequate surgical drainageVirulent strain of offending organismProlnged course of antibiotic therapyPresence of foreign body  <response>: Ans. B: Virulent strain of offending organism Virulence is by the degree of pathogenicity within a group or species of microorganisms or viruses as indicated by case fatality rates andor the ability of the organism to invade the tissues of the host. The pathogenic capacity of an organism is determined by its virulence factors. In discussing disease, the adjective virulent is used to describe effect severity, and in discussing pathogens, the degree of infectiousness High the virulence, acute the infection will be. 