Gram-positive bacteria

Gram-positive

Rods

Spore-formers

Non-spore formers

Clostridia spp.

Acute/chronic diarrhea in SA

Strains: Neurotoxic,

Histotoxic,

Enterotoxic

-

Aerobic

Anaerobic

Bacillus spp.

Farm animal mastitis abortion anthrax

Actinomyces spp.

Opportunistic + pyogranulomatous infection

Lumpy jaw in ruminants

Nocardia spp.

Intracellular

Suppurative infection often involving lymph nodes

Abortion in ruminants

Dermatophilus spp.

Exudative dermatitis in LA

Aerobic

Corynebacterium spp.

Commensals of skin + MM.

Opportunistic, pyogenic infections

Listeria spp.

Spoiled silage

Septicemia, encephalitis, abortion, endophthalmitis in ruminants

Weakly gram-positive

Acid Fast Rods

Aerobic

Mycobacterium spp.

Progressive granulomatous infection

TB + Johne's disease + feline leprosy

Cocci

Facultatively anaerobic

Staphylococcus spp.

Commensals of skin + MM

Opportunistic infections causing pyrexia

Streptococcus spp.

Horses: strangles

Commensals of MM + URT + UroGen tract

Opportunistic infections

Trueperella pyogenes

Opportunistic infections

Summer mastitis​​​​​​

Rhodococcus equi

Foals: opportunistic infection causing suppurative bronchopneumonia

Catalase (-)

Catalase (+)

Oxidase (+)

Erysipelothrix rhusiopathiae

Erysipelas in pigs & turkeys

Catalase (-)

Coagulase (+)

Catalase (+)

Catalase (-)

Catalase (+)

Catalase (+)

Catalase (-)

Facultatively anaerobic