eubacteria, eubacterium, true bacteria - a large group of bacteria having rigid cell walls; motile types have flagella

Enterobacteriaceae, family Enterobacteriaceae - a large family of gram-negative rod-shaped bacteria of the order Eubacteriales

escherichia - a genus of enteric bacteria

klebsiella - a genus of nonmotile rod-shaped gram-negative enterobacteria; some cause respiratory and other infections

salmonella - rod-shaped gram-negative enterobacteria; cause typhoid fever and food poisoning; can be used as a bioweapon

shigella - rod-shaped gram-negative enterobacteria; some are pathogenic for warm-blooded animals; can be used as a bioweapon

erwinia - rod-shaped motile bacteria that attack plants