Plague epizootic cycles in Central Asia

Area of Science:

• Epidemiology
• Ecology
• Disease Dynamics

Background:

• Infection thresholds in disease epidemiology are influenced by host and vector abundance.
• Wildlife host and vector populations fluctuate, potentially crossing thresholds and impacting disease spread.
• Interdependencies between vector and host populations can affect infection dynamics.

Purpose of the Study:

• To investigate the temporal dynamics of plague (Yersinia pestis) in great gerbils and their flea vectors.
• To analyze the interaction between host and vector abundances and its effect on infection dynamics around the threshold.
• To explore the role of biological and detectability delays in observed plague dynamics.

Main Methods:

• Studied temporal dynamics of plague, fleas, and great gerbils in Kazakhstan.
• Described host-vector abundance interactions over time.
• Analyzed the influence of these interactions on infection spread and delays.

Main Results:

• Host and vector abundances interact dynamically, influencing plague spread.
• The system's dynamics around the infection threshold are driven by these interactions.
• Biological and detectability delays play a significant role in observed plague dynamics.

Conclusions:

• Plague dynamics are significantly influenced by the interplay of host and vector abundances and temporal delays.
• Understanding these complex interactions is crucial for predicting and managing wildlife diseases.
• The study highlights the importance of considering population fluctuations and delays in epidemiological models.