Infectious Dose

**Semantic type:** Conceptual Entity

**Definition:** A dose at which an infectious organism can reproduce in the host or the system in which it has been inoculated and to produce measurable effect(s). This effect may not be limited to the display of symptoms, but may also include postconvalescence antibody titers, morphologic changes, development of cellular immunity, and presence of nucleic acid incorporation.

**Synonyms:** - Infection Dose - Infective Dose