Dynamic interaction between transmission, within-host dynamics and mosquito density.

Area of Science:

• Epidemiology
• Immunology
• Mathematical Modeling

Background:

• Vector-transmitted diseases involve complex interactions between hosts, vectors, and the environment.
• Understanding within-host and between-host dynamics is crucial for disease control strategies.
• Environmental transmission differs from vector-borne transmission, where the vector population acts as the environmental stage.

Purpose of the Study:

• To investigate the character and role of within-host and between-host interactions in vector-transmitted diseases.
• To compare these dynamics with those of environmentally-transmitted diseases.
• To explore how immunological factors and vector abundance influence disease transmission and outbreak dynamics.

Main Methods:

• Developed a coupled epidemiological and immunological model for vector-transmitted diseases.
• Modeled the host-to-vector transmission rate as a function of within-host infected cell levels.
• Incorporated a virus inoculation term dependent on infected mosquito abundance.

Main Results:

• Disease outbreaks necessitate active within-host viral infections.
• Outbreak characteristics (nature, duration, dynamics) are shaped by within-host infection intensity and mosquito transmission capacity.
• Established inter-relations between infectivity, host recovery, viral clearance, and population-level disease dynamics.

Conclusions:

• Within-host viral dynamics and vector transmission capacity are key determinants of vector-borne disease outbreaks.
• The model provides insights into the interplay between individual host immunity and population-level disease spread.
• Mathematical modeling is valuable for understanding complex disease transmission systems.