Category:Pasteurella and Mannheimia species

Overview Pasteurella and Mannheimia

• Common commensals of the upper respiratory tract and gastrointestinal tract mucosa of animals
• Usually opportunistic organisms, causing disease during times of stress, low resistance or concurrent infection
• Not part of the human bacterial flora
• Small Gram-negative bacilli or coccobacilli
• Facultative anaerobes
• Oxidase-positive
• May show bipolar staining with polychrome stains such as Wright's stain
• Capsules contain acidic polysaccharides

Pasteurella Properties

• Catarrhal odour
• Produce endotoxins which cause host damage and death
• Their capsules resist phagocytosis

• Pasteurella may be found in deep pyoderma