Chapter 25, Problem 2MCQ

Summary Introduction

Introduction:

Microorganisms that have the ability to cause infectious diseases are called as pathogens. Such microorganisms include bacteria, fungi, virus, and protozoa. Illness in an individual is caused either by disturbing the normal metabolic activity of the host or by inducing the host’s immune system to produce a response. Pathogenic bacteria have developed a wide range of mechanisms to infect the human system. Such pathogens have the ability to colonize and invade organs of the human system and ultimately leading to serious diseases in human.