Resit-pathogenicity

rising mammals under germ-free environments, or conditions with controlled spectra and numbers of microorganisms.

• to control the environment in which a multicellular organism develops ; • to use genetically modified model systems; • to study the establishment and maintenance of the immune system • to provide new insights on aetiologies of infectious diseases and potentially cancer.

Dysfunction of organs, cells or metabolic pathways in the body

optimal state of the body. All organs and their functions are in the perfect conditions, as they are supposed to be in accordance of genetics, physiology and biochemistry of a given organism..

is a set of actual mechanisms by which an etiological factor causes a disease

one organism (a parasite) lives and benefits for the expense of another.

both organisms benefits from each another

one organism benefits from another, without obvious harm for the last.

cause disease in hosts with a reduced defensive capacity (for example, a decline of the immune system).