From the flu to COVID-19, viruses are a major threat in our everyday lives. In today’s episode of Crash Course Biology, we’ll learn why viruses are like genes in a box, and how they invade and spread between cells. We’ll also discover how vaccines and medicines help our bodies fight back. <br /><br /><br />Introduction: Discovering Viruses 00:00<br />What We Have in Common With Viruses 1:24<br />Evolutionary Theories of Viruses 2:49<br />Hosts & Infection 3:55<br />Retroviruses 6:49<br />Vaccines 8:11<br />Dr. Quarraisha Abdool Karim & Antivirals 9:41<br />Review & Credits 11:39
