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Issued by National Cancer Institute.

Publisher: National Cancer Institute.

This source is credited to an organization.

Online text: training.seer.cancer.gov/anatomy/endocrine/glands/adrenal.html

Cited passages: Hormones of the Adrenal Medulla: secretion in response to sympathetic stimulation.

An infection caused by bacteria.

An infection involves invasion and multiplication of an infectious agent in a host. Bacteria are one possible cause; an agent capable of causing disease is a pathogen. The National Cancer Institute defines infection through invasion and growth in the body. ^[ref].

In a SIR model, acquiring infection moves a member of the susceptible compartment into the infectious compartment. That immediate transition is a model assumption: the SEIR model instead includes an exposed stage before infectiousness. Specify these states when translating a biological process into compartmental models.