latent-virus infection. (medicine). A chronic, inapparent virus infection in which a virus-host equilibrium is established. (virology).A persistent viral infection in which there is little or no demonstrable presence of the virus and disease symptoms for a long time between episodes of recurrent outbreaks.atent-virus infection. (medicine). A chronic, inapparent virus infection in which a virus-host equilibrium is established. (virology).