TEDA Emerging And Exotic Diseases Of Animals (EEDA) Exam 1 Practice

Which transmission mode requires a living organism to spread the pathogen between hosts?

Direct transmission Indirect contact Vector-borne transmission Iatrogenic

Correct Answer:

Vector-borne transmission

Explanation:

A living organism that carries and passes the pathogen between hosts is a vector. In vector-borne transmission, an intermediary such as a mosquito, tick, or flea is required; the pathogen may even multiply or develop inside the vector before being transmitted when the vector bites a new host. This is why it uniquely needs a living carrier to move the pathogen. Direct transmission, by contrast, happens straight from one host to another during contact or through droplets, with no intermediary organism. Indirect contact involves inanimate vehicles like contaminated surfaces or objects. Iatrogenic transmission occurs through medical procedures or contaminated equipment, not via a biological carrier.

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