immunology 4

The condition when hosts carry potentially pathogenic organisms, but do not show signs of the disease themselves.

The property of attraction of the migration of cells towards a molecule (the chemotactic agent).

The introduction, and continued growth, of microorganisms on a particular body location.

A biological relationship between two organisms where one species benefits but the second does not appear to benefit, but is not harmed nevertheless.

An organism which is only capable of causing disease in a host under certain conditions, especially when the host defenses are compromised.

The biological relationship between two organisms where one organism benefits at the expense of the second, which is harmed to some degree.

An organism capable of causing a disease.

The organisms that may be expected to be found in a particular body site,

A biological relationship between two organisms where both organisms benefit by that relationship.

Organisms that may only temporarily be resident in a particular body site, but are not necessarily pathogens.

An organism that is always considered pathogenic at the site it was located, regardless of the immune status of the host.

The capability of an organism to cause disease.

A specific characteristic or molecule, produced by a pathogen, that enhances that organism's ability to cause disease.