(normal microbiota). Refers to those microbes that live in and on certain areas of the human body normally and are not harmful. They are in fact beneficial (Lactobacillus for example, because of this it is used as a probiotic)
Mutualistic relationship (in flora)
Humans and gut bacteria. Both benefit. Humans benefit by the production of vitamins such as vitamin K by gut flora.
(bacterial diseases) Is due to the effect of toxins. Secreted by certain bacteria (e.g.: the tetanus toxin, pertussis toxin)
(bacterial diseases) Is due to the effect of toxins. Part of the cell wall of Gram-negative bacteria.
Endotoxins in small amounts
Lead to a protective inflammatory response.
Endotoxins in large amounts
Cause Disseminated Intravascular coagulation (DIC) & fatal septic shock.
The damage viruses do while replicating inside host cells or the immune response itself are major contributors to symptoms.