Which of the following is an example of vector-borne transmission?

• A. Direct contact is an example of vector-borne transmission.
• B. Mosquito-borne.
• C. Fecal-oral.
• D. Airborne.

Answer: (B)

Vector-borne transmission occurs when a living organism, the vector, transmits an infectious agent from one host to another. The essential point is that the spread depends on this intermediary organism rather than direct contact or environmental routes. A mosquito as the vector transmits pathogens during feeding, which is why mosquito-borne describes a route where the disease is carried by a vector. Many diseases, like malaria or dengue, rely on mosquitoes to move the pathogen between people. In contrast, direct contact involves physical transfer between hosts without an intermediary vector; fecal-oral involves ingesting pathogens from contaminated food or water; and airborne involves pathogens traveling through air via droplets or aerosols.