Understanding Germs: The Microbial World Germs, broadly defined as microorganisms,  including bacteria, viruses, fungi, and protozoa that can cause infections and diseases. Each of these categories represents a unique structure and biological function, contributing to the complex interactions that underpin various ecosystems, including those within the human body. Bacteria, for instance, are single-celled organisms that … Continue reading Evolution of Germs, Vaccines, and Their Historical Impact