explain as specifically as possible how each of the following helps to enhance safety in the microbiology lab. Explain whether each is necessary in all instances. Negative air flow (i.e., air flows into laboratory rather than out Solution 29 Equipments every microbiology laboratory should have General Concepts : The clinical presentation of an infectious disease reflects the interaction between the host and the microorganism. This interaction is affected by the host immune status and microbial virulence factors.Sings and symptomes vary according to the site and severity of infection. Diagnosis requires a composite of information, including history, physical examination, radiographic findings, and laboratory data. In fections may be caused by bacteria, viruses, fungi, and parasites. The pathogen may be exogenous(acquired form environmental or animal sources or from other persons) or endogenous (from the normal flora)..