Which mode of pathogen exchange is primarily carried by insects such as mosquitoes?

• A. Direct
• B. Indirect
• C. Airborne
• D. Vector - mosquitoes

Answer: (D)

Vector-borne transmission is when a living organism, such as a mosquito, carries a pathogen from an infected host to a susceptible one. Mosquitoes become infected by biting an infected person or animal, the pathogen may multiply or develop inside the mosquito, and then the mosquito transmits the pathogen to another host with its next bite. This is different from direct transmission, which requires close person-to-person contact; indirect transmission via inanimate objects or surfaces (fomites); and airborne spread, where pathogens travel through the air as droplets or aerosols. Knowing mosquitoes act as vectors helps explain why control measures focus on reducing mosquito bites and mosquito populations to interrupt disease spread.