Introduction

knowing how diseases are spread will help you to understand how your body fights a specific disease.

The body defends himself against pathogens and microorganisms by a series of mechanisms that can be achieved through three lines of defense:

1 - Non-specific Immunity ( includes first lines of defense and second lines of defense)
2- Specific Immunity

The defense of your body can be enhanced through active and passive immunity, which we will learn about later on.

Finally, we will be studying how diseases are spread and we will focus mainly about Sexually Transmitted Disease ( HIV)

Source of image : The Massachusetts Workers’ Compensation Act (www.workrightspress.com/workerscompch1.html)