How is Pasteurella identified?
The Minitek identification of Pasteurella depends on 100% positive xylose reactions, whereas only 56% of the P. haemolytica strains were positive for xylose fermentation. The Oxy/Ferm system, instead of giving a definitive identification, in most instances merely placed Pasteurella in a category of similar organisms.
What is the gram morphology of Pasteurella?
Pasteurella multocida is a small, gram-negative, nonmotile, non–spore-forming coccobacillus with bipolar staining features. The bacteria typically appear as single bacilli on Gram stain; however, pairs and short chains can also be seen.
What does Pasteurella look like?
The members of the genus Pasteurella are small, nonmotile, non-spore-forming, gram-negative organisms. In Gram-stained specimens, they generally appear as a single bacillus, often with bipolar staining, but may also be seen in pairs or short chains (picture 1) [1].
What is Pasteurella infection?
Pasteurella species most commonly cause skin and soft tissue infections following an animal bite or scratch, typically from a cat or dog. Pain, tenderness, swelling, and erythema often develop and progress rapidly. Localized lymphadenopathy and lymphangitis are common.
What are the symptoms of Pasteurella multocida?
Respiratory disease caused by Pasteurella multocida follows a relatively nonspecific course, with cough fever, shortness of breath, and chest pain being common complaints. Pneumonia is the most common type of infection, although tracheobronchitis, empyema, and lung abscesses may also occur.
Is Pasteurella Gram positive or negative?
Pasteurella are small gram-negative coccobacilli that are primarily commensals or pathogens of animals. However, these organisms can cause a variety of infections in humans, usually as a result of cat scratches, or cat or dog bites or licks.
Is Pasteurella catalase positive or negative?
Pasteurella is a genus of Gram-negative, facultatively anaerobic bacteria. Pasteurella species are nonmotile and pleomorphic, and often exhibit bipolar staining (“safety pin” appearance). Most species are catalase- and oxidase-positive.
Is Pasteurella a virus or bacteria?
Pasteurella spp. are very small, nonmotile, nonspore-forming gram-negative bacteria that are coccoid, oval or rod-shaped. Pasteurella spp. grow on ordinary laboratory media at 98.6°F (37°C), and most species are catalase-positive and oxidase-positive.
Is Pasteurella an Enterobacteriaceae?
The absence of growth on MacConkey agar suggests that the organism from this patient is not one of the typically encountered members of the Enterobacteriaceae family. Pasteurella infections (with P. multocida or other Pasteurella spp.) have a wide range of clinical presentations.
What causes Pasteurella infection?
Can Pasteurella aerogenes be isolated from human specimens?
Pasteurella aerogenes is rarely isolated from human specimens. The species is found in the digestive tract of pigs. From 1976 to 1994 7 strains were cultured in Denmark from wounds or ulcers. Five patients were bitten by pigs and 2 patients with ulcers were employed in pig farming. A mixture of bacterial species was often found.
What are the characteristics of Pasteurella species?
Pasteurella spp. are very small, nonmotile, nonspore-forming Gram-negative bacteria that are coccoid, oval or rod-shaped. They often exhibit bipolar staining. They are aerobic and facultatively anaerobic. Most species are catalase-positive and oxidase-positive. They attack carbohydrates readily, forming acid but no gas.
Is Pasteurella catalase positive or oxidase positive?
Most species are catalase-positive and oxidase-positive. They attack carbohydrates readily, forming acid but no gas. Nitrates are reduced to nitrite. Pasteurella spp. will grow on ordinary laboratory media at 98.6°F (37°C).
What is Pasteurella multocida?
Pasteurella multocida (syn. Pasteurella septica) types A, B, D, E, F. the cause of hemorrhagic septicemia in cattle, sheep and pigs, fowl cholera of birds, pasteurellosis of rabbits, and gangrenous mastitis of ewes. It is also commonly found in atrophic rhinitis of pigs.