Bacteria

Actinobacillus species

Actinomycetes Aeromonas species, Plesiomonas shigelloides and Vibrio species

Bacillus species

Bacteroides

Bordetella bronchiseptica and Bordetella avium

Brucella species

Campylobacter species

Chlamydia and Chlamydophila species

Clostridium species

Corynebacterium species

Enterobacteriaceae

Erysipelothrix rhusiopathiae

Francisella tularensis

Fusobacterium

Haemophilus species

Helicobacter

Lawsonia intracellularis

Listeria species

Moraxella bovis

Mycobacteria spp.

Mycoplasmas

Pasteurella species and Mannheimia haemolytica

Pathogenic anaerobic non-spore-forming Gram-negative bacteria

Pseudomonas aeruginosa and Burkholderia species

Rhodococcus equi

Rickettsiales

Spirochaetes

Staphylococcus spp.

Streptococci

Taylorella equigenitalis