ralstonia insidiosa ralstonia insidiosa ralstonia insidiosa is a gram-negative, environmental bacterium. it has been shown to be a pathogenic in immunocompromised patients in hospital settings. this bacterium is closely related to ralstonia pickettii. ralstonia insidiosa scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: burkholderiaceae genus: ralstonia species: r. insidiosa binomial name ralstonia insidiosacoenye et al.. 2003