“Humanity shares a common ancestry with all living things on Earth. We often share especially close intimacies with the microbial world. In fact, only a small percentage of the cells in the human body are human at all. Yet, the common biology and biochemistry that unites us also makes us susceptible to contracting and transmitting infectious disease.” ScienceHealthPublic HealthInfectious DiseasesMicrobiology Book:Infectious Diseases: In Context Source: Infectious Diseases: In Context