What is virulence–

Correct option is C

Sol. Virulence refers to the degree of severity or disease-causing ability of a microorganism. A highly virulent pathogen causes serious illness even in small amounts, while less virulent organisms may produce mild or no symptoms.
Explanation of each option:
· (a) A disease of intestine – This is incorrect as virulence is not specific to any body part; it is a property of pathogens affecting any system.
· (b) Fungus infection of nails – This is called onychomycosis, a specific condition, but not related to the concept of virulence.
· (c) Disease causing capacity of organisms – Correct answer. This defines virulence: the potential of a microorganism to cause disease and its severity.
· (d) Liver – The liver is a body organ and not related to the definition of virulence. The term does not refer to any organ specifically.