Host genetics and pathogen species modulate infection-induced changes in social aggregation behaviour

Area of Science:

• Behavioral Ecology
• Infectious Disease Dynamics
• Host-Pathogen Interactions

Background:

• Understanding how infections alter host behavior is crucial for predicting disease spread.
• Social contact networks significantly influence infectious disease dynamics.

Purpose of the Study:

• To investigate how bacterial infections modify social behavior in Drosophila melanogaster.
• To determine if these behavioral changes are influenced by pathogen species, dose, host genetics, and sex.

Main Methods:

• Systemic bacterial infection of fruit flies with four different bacterial species.
• Observation and quantification of social aggregation and pairwise distances in infected and susceptible flies.
• Analysis of genetic and sex-based variations in social behavior.

Main Results:

• Bacterial infection reduced mean pairwise distance in female fruit flies, with variations depending on the pathogen species.
• Susceptible flies did not avoid infected individuals.
• Significant genetic and sex-based differences in social aggregation were observed; infected females aggregated more closely than males.

Conclusions:

• Bacterial infections induce behavioral changes in fruit flies, affecting social aggregation.
• These behavioral modifications are pathogen-specific, host genetic-dependent, and sex-specific.
• Sex differences in social aggregation may contribute to variation in pathogen transmission.