virgibacillus siamensis virgibacillus siamensis virgibacillus siamensis is a bacterium. it is gram-positive, rod-shaped and moderately halophilic, originally isolated from fermented fish in thailand. ms3-4t is the type strain (jcm 15395t =pcu 312t =tistr 1957t). virgibacillus siamensis scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: bacillaceae genus: virgibacillus species: v. siamensis binomial name virgibacillus siamensistanasupawat et al. 2011