What term is used for showing no symptoms or signs of infection?

The term used for showing no symptoms or signs of infection is "asymptomatic." This term specifically refers to individuals who carry a pathogen but do not display any noticeable clinical symptoms associated with an infection. Asymptomatic carriers can still be important in the context of infection control because they have the potential to spread the infection to others without being aware of their status.

In contrast, "symptomatic" refers to individuals who exhibit clear symptoms of an infection. "Incubatory" describes the period following pathogen exposure where an individual may be infected but not yet show symptoms, while "contagious" pertains to the ability to transmit an infection to others, which can occur whether or not symptoms are present. Thus, "asymptomatic" accurately captures the absence of symptoms in individuals who may be infected.