© 2004-2011 Baylor College of Medicine. Through a series of inquiry-based lessons, students explore the world of microorganisms. They learn that microbes can be bacteria, fungi, protists, or viruses, and they create scale models to compare microbes’ relative sizes. Using evidence to determine whether a patient has a cold, flu, or strep infection, students discover the differences between bacterial and viral infections; they explore modes of transmission for infamous diseases, and they are introduced to the human immune system.