What best describes Passive/Mechanical Transmission?

Passive/Mechanical Transmission refers to the process whereby a pathogen is carried from one host to another without undergoing any multiplication or transformation in the carrier organism during the transmission. In this context, the pathogen remains inert during the transfer, allowing it to spread simply as a result of contact with the carrier, such as an insect or an environmental surface.

In passive/mechanical transmission, the carrier organism, often a vector like an insect, merely harbors the pathogen on its surface. For example, if a mosquito lands on contaminated water and then lands on a human, it can transfer the pathogen without it reproducing or becoming active during that process. This is the key characteristic that distinguishes passive or mechanical transmission from other modes, where pathogens may actively invade or multiply within the carrier before spreading.

Options that imply multiplication or active involvement of the carrier are not relevant to passive/mechanical transmission, which is characterized by its simplicity in pathogen transfer without any active participation or alteration of the pathogen during the process. Thus, option B correctly encapsulates the essence of Passive/Mechanical Transmission.