microorganism mutualistic relationships. The trichlorphon-degrading symbiont Citrobacter
freundii (CF-BD) of the oriental fruit fly Bactrocera dorsalis was recently discovered;
however, its intraspecies transmission pathway among flies remains unknown. Here, we use
fluorescence in situ hybridization (FISH), PCR detection, and a series of ingenious
experiments to reveal that CF-BD was aggregated in rectal pads associated with the female …