Crash Course Outbreak Science Season 1 Episode 2 How Do Outbreaks Start? ( Air Date 2021-09-14 ) Genre Documentary category. Overview "You may not realize it, but your body is like a fortress, designed to defend you from tiny foreign invaders known as pathogens. This seemingly small world is actually super diverse, and sometimes super dangerous too. That’s why in this episode of Crash Course Outbreak Science, we’re going to get familiar with all different types of pathogens like viruses, bacteria, fungi, and more!".