Pasteurella Flashcards
What type of organism is Pasteurella?
High adapted parasitic organisms
Gram reaction and morphology of Pasteurella?
Gram-negative pleomorphic coccobacilli.
Is Pasteurella motile? What about oxidase/catalase and oxygen requirement?
Non-motile, usually oxidase and catalase positive, aerobic to microaerophilic.
What does P. anatipestifer cause?
Septicemia in ducks and fowl.
How many species are in the Pasteurella genus (based on DNA homology)?
11 species.
What are the two important Pasteurella pathogens of domestic and wild animals?
P. multocida and P. haemolytica.
What does P. multocida cause in cattle and birds?
Primary septicemia and is also an opportunistic invader.
True or False: P. multocida is non-flagellated.
True.
How does P. multocida appear in stained tissue films?
Shows distinct bipolar appearance; not seen in cultured organisms.
Describe the colony of P. multocida on agar.
Mousy odor, smooth, convex, 1-2 mm in diameter.
What color haze does P. multocida show on blood agar plate (BAP)?
Green haze.
Describe the texture of highly encapsulated strains of P. multocida.
Mucoid or watery.
How many biotypes or biovars exist for P. multocida?
7 biotypes.
What sugars are not fermented by dog strains of P. multocida (biotype)?
Sorbitol and mannitol.
Describe smooth/fluorescent colonies of P. multocida.
Medium-sized, discrete, quite virulent in mice, typable.
What is biotype 3 in Carter’s biotype classification?
Hemorrhagic septicemic type.
Describe mucoid colonies of P. multocida.
Large, flowing, moderately virulent in mice, not typable.
Describe rough/blue colonies of P. multocida.
Small, discrete, low virulence, autoagglutinable.
What is the most prevalent capsular type among isolates from animals?
Type A.
How many somatic or O antigens are present in P. multocida?
At least 11.
What are the modes of transmission between animals?
Airborne droplets, food, and water contamination.
What serious disease in cattle/goats causes economic loss in Asia/Africa?
Hemorrhagic septicemia.
During what season does hemorrhagic septicemia occur?
Rainy season.
How is fowl cholera transmitted?
Oral and respiratory routes.
What is snuffles?
A milder respiratory infection caused by P. multocida.
What capsular type is involved in atrophic rhinitis?
Type D (with Bordetella bronchiseptica).
