What is the difference between a pathogen and contagion?

A pathogen is a biological agent that causes disease or illness to its host. It can be a virus, bacteria, fungus, or parasite. Pathogens can spread through a variety of means, including direct contact, indirect contact, and airborne transmission.

A contagion is a disease that is easily transmitted from person to person, or from animal to person. Contagious diseases are typically caused by pathogens that can spread through direct contact, such as skin-to-skin contact or contact with bodily fluids, or by indirect contact, such as contact with contaminated surfaces or objects.

In summary, a pathogen is a biological agent that causes disease, while a contagion is a disease that is easily transmitted from person to person.