Viral infection

An infection caused by a virus. Entry, genome expression and production of infectious particles are distinct stages; detecting viral nucleic acid does not alone measure all of them.

A viral disease whose effects differ greatly with developmental context. Infection during pregnancy can harm fetal development, connecting a relatively mild maternal illness with potentially serious congenital effects.

A highly transmissible viral disease caused by measles virus. Respiratory transmission and systemic effects distinguish it from a rash defined only by appearance.^[ref]

Hepatitis caused by a viral infection. Different hepatitis viruses have distinct transmission routes and long-term behavior, so liver inflammation alone does not identify which virus is involved.

A viral hepatitis commonly transmitted through fecal contamination of food, water or close contacts. It usually produces an acute infection rather than the chronic infection associated with some other hepatitis viruses.

Persistence of a virus in a restricted programme distinct from productive particle formation. Latency does not mean complete molecular inactivity.