What are important determinants of vector-borne disease transmission?

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Vector-borne disease transmission is driven by how the vector behaves and how the pathogen develops inside the vector. If vectors live longer, they have more opportunities to bite and to become infectious, so survival influences how often transmission can occur. More vectors, due to higher reproduction, increase the number of potential bite events in the population, raising transmission opportunities. The rate at which vectors bite hosts directly sets how often contact and potential transmission happen. Finally, the pathogen’s incubation rate inside the vector (the extrinsic incubation period) determines how quickly a mosquito, tick, or other vector becomes capable of transmitting the pathogen after acquiring it; a shorter period means earlier transmission and higher spread. Together, these aspects—vector longevity, vector density (influenced by reproduction), biting rate, and the extrinsic incubation period—are central to how intensely a vector-borne disease can spread.

Other options miss the broader set of drivers: host genetics can affect individual susceptibility but not the population-level transmission dynamics; climate influences are important but act through their effects on vector biology and behavior rather than alone determining transmission; and vector-borne diseases rely on vectors, not direct contact transmission.