Kingdom: Bacteria

Phylum: Firmicutes

Class: Clostridia

Order: Clostridiales

Family: Clostridiaceae

Genus: Clostridium

Species: C. tetani

Domain: Bacteria

Class: Clostridia

Order: Clostridiales

Family: Clostridiaceae

Genus: Clostridium

Species: C. botulinum

Kingdom: Bacteria

Phylum: Firmicutes

Class: Clostridia

Order: Clostridiales

Family: Clostridiaceae

Genus: Clostridium

Species: C. perfringens

Kingdom: Bacteria

Phylum: Firmicutes

Class: Clostridia

Order: Clostridiales

Family: Clostridiaceae

Genus: Clostridium

Species: C. difficile

Domain: Bacteria

Phylum: Proteobacteria

Class: Gammaproteobacteria

Order: Enterobacteriales

Family: Enterobacteriaceae

Genus: Escherichia

Species: E. coli

Superkingdom: Bacteria

Kingdom: Bacteria

Phylum: Proteobacteria

Class: Gammaproteobacteria

Order: Enterobacteriales

Family: Enterobacteriaceae

Genus: Salmonella

Domain: Bacteria

Division: Firmicutes

Class: Bacilli

Order: Bacillales

Family: Bacillaceae

Genus: Bacillus

Domain: Bacteria

Phylum: Firmicutes

Class: Bacilli

Order: Bacillales

Family: Bacillaceae

Genus: Bacillus

Species: anthracis

Kingdom: Bacteria

Phylum: Cyanobacteria

Class: see taxonomic note

Order: Nostocales

Family: Nostocaceae

Genus: Nostoc

Domain: Archaea

Kingdom: Euryarchaeota

Phylum: Euryarchaeota

Class: Halobacteria

Order: Halobacteriales

Family: Halobacteriaceae

Genus: Halobacterium