Chapter 50, Problem 3S

Summary Introduction

To explain:

That some people never catch cold due to difference in receptors on their respective cell surfaces.

Introduction:

The body mechanisms that protect against the infections are innate immunity and adaptive immunity. Innate immunity is also known as non-specific defense, which provides response regardless of exposure numbers and pathogen type. Innate immunity provides response to invading pathogens which involves both blood cells and soluble factors.