General Information: This strain is a North American clinical isolate from human blood. Photorhabdus asymbiota, formerly Xenorhabdus luminescens, has been isolated from human wound and blood infections often in association with spider bites. This species can also be isolated from the entomopathogenic nematode Heterorhabditis indica. Photorhabdus asymbiota is divided into two subspecies, subsp. australis which contains the Australian clinical isolates and subsp. asymbiota which contains the North American isolates. Photorhabdus is currently subdivided into three species, luminescens, temperate and asymbiotica all of which have been isolated as symbionts of heterorhabditid nematodes. This organism is unusual in that it is symbiotic within one insect, and pathogenic in another, the only organism that is known to exhibit this dual phenotype.