Aug

19

From Here :

Photorhabdus asymbiotica is an emerging bacterial pathogen that causes locally invasive soft tissue and disseminated bacteremic infections in the United States and Australia.

Although the source of infection was previously unknown, we report that the bacterium is found in a symbiotic association with an insect-pathogenic soil nematode of the genus Heterorhabditis.

From Here :
Photorhabdus are the only known terrestrial bioluminescent bacteria. Most members of the Photorhabdus are however insect pathogens that live in a strict symbiotic relationship within the guts entomopathogenic Heterorhabditid nematodes. Infective juvenile nematodes search in the soil for insect prey until they encounter a suitable host. They then scratch their way into the insect’s hemocoel (an “open” blood system ) and “vomit” up Photorhabdus cells directly into the blood. The Photorhabdus then set up a lethal septicemia, secreting toxins and virulence factors that rapidly kill the insect host. The bacteria replicate rapidly and bio-convert the insect tissues into more bacteria that serve as a food source for the reproducing nematodes. It is around the time of insect death that the bioluminescence of the insect corpse can be seen.


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