Define medical microbiology. Name two contributions of Robert Koch in microbiology. Define Koch's phenomenon. Name two contributions of Joseph Lister.

Here's the answer to the first question:

Medical microbiology is a branch of medicine that deals with the study of microorganisms (such as bacteria, viruses, fungi, and parasites) that are pathogenic to humans. It focuses on the diagnosis, treatment, and prevention of infectious diseases, as well as understanding the host's immune response to these pathogens.