What does the term "dead end host" mean?

The term "dead end host" refers specifically to a host that becomes infected with a pathogen but does not have the capacity to transmit that pathogen to others, thereby interrupting the transmission cycle. This concept is important in understanding disease dynamics, especially in the context of infectious diseases.

When a host cannot effectively serve as a reservoir for the pathogen, it prevents the pathogen from spreading further within the population. For example, certain animals may acquire a virus but cannot shed it in a manner that allows transmission to other organisms. As a result, these hosts help to limit the spread of the disease.

The other options describe different aspects of host-pathogen interactions. For instance, a host that does not develop symptoms may still potentially transmit the disease, while a healthy carrier can pass on the pathogen without manifesting the illness. A host that reproduces the pathogen is actively involved in the disease cycle, and therefore does not fit the definition of a dead end host.