BIO 111 Chapter Notes - Chapter 19: Sutterella, Quorum Sensing, Essential Products
Document Summary
A small minority of bacteria are pathogens: ko(cid:272)h"s postulates. The microorganism is always found in individuals with the disease. The microorganism can be taken from the host and grown in pure culture. A sample of the culture produces the same disease when injected into a new, healthy host. The newly injected host yields a new, pure culture of microorganisms identical to those obtained in the second state: for an organism to be a successful pathogen, it must: Arrive at the body surface of a potential host. Infect a new host: consequences of bacterial infection depends on invasiveness and toxigenicity of the bacteria. Invasiveness its a(cid:271)ilit(cid:455) to (cid:373)ultipl(cid:455) i(cid:374) the host"s (cid:271)od(cid:455) Toxigenicity its ability to produce toxins. Endotoxins are released when certain gram-negative bacteria grow or lyse and are generally lipopolysaccharides. They are rarely fatal to the host, but cause fever, vomiting, and diarrhea. Exotoxins soluble proteins released by living, multiplying.
