Introduction
Session 3 provides a brief overview of the many different infectious agents, also known as pathogens [path-oh-jens],that cause infectious diseases in humans and the ways in which these pathogens are transmitted between people, the environment and other animals. The most numerous pathogens are bacteria, as you will discover. In fact, there are more than twice as many different types of bacteria that cause human disease compared to the number of infection causing viruses.
In the video you'll learn more about these two different types of pathogens and how they are different from one another.
OpenLearn - Infection and immunity
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