Answer:
B. Mode of Transmission
Explanation:
The mode of transmission is when the pathogen is transmitted either directly or indirectly. Direct transmission, requires close association with the infected host. Indirect transmission, requires a vector, such as an animal or insect. The method of transmission, starts on pathogens from a reservoir to a susceptible host. Once the pathogen has exit the reservoir, it needs a mode of transmission to the host through a portal of entry. Once it enters, the host becomes susceptible to the pathogen.
