What is the reservoir for most pathogens?

Most pathogens primarily rely on infected hosts as their reservoirs. An infected host, whether human or animal, provides an ideal environment for pathogens to thrive, reproduce, and spread to new hosts. These hosts carry the pathogens, which can be transmitted through direct contact, bodily fluids, or other means, facilitating the continuation of the infectious cycle.

Infected hosts are critical because they harbor the pathogen and often exhibit signs of disease, which can aid in the transmission to others. This interaction between the pathogen and the host allows for an effective means of survival and propagation.

Although healthy humans and the environment can play roles in the transmission of certain pathogens, they are not the primary reservoirs for most infectious agents. Healthy individuals may transport some pathogens but typically do not support their growth or transmission as infected hosts do. Laboratory conditions might be used for studying pathogens, but they do not serve as natural reservoirs.