Chapter 21: Nonfermenting gram-Negative Bacilli Flashcards
Exam 3
Organisms that ferment carbohydrates
fermenters
Organisms that do not ferment carbohydrates
Nonfermenters
Nonfermenters prefer what type of environment
Moist environment
Nonfermenters prefer and grow much better in what kind of environment?
Aerobic environment
Is nonfermenting or fermenting are long thin gram-negative bacilli
Nonfermenting
Is nonfermenting or fermenting tend to be resistant to multiple classes of antibiotics
Nonfermenting
Most group members are oxidase-positive
Nonfermenting
Asaccharolytic
Do not break down carbohydrates
Nonfermenting fail or acidify oxidative fermintative (OF) media when overlaid with mineral oil
Fail to acidify
Oxidation
Utilize carbohydrates aerobically
Fermentation
Utilize carbohydrates anaerobically
Asaccharolytic
Do not utilize carbohydrates
This test determines the ability of a bacteria to ferment a specific carbohydrate incorporated into a basal medium
Carbohydrate fermentation test
Only open tube that produces acid (oxidizer)
Aerobic tube for O/F basal media
Only closed tube produces acid (fermenter)
Overlaid with sterile mineral oil
Anaerobic tube for O/F basal media
This bacteria accounts for largest percentage of all nonfermenters isolated from clinical specimens
Pseudomonas but is also called pseudomonads
This bacteria is the leading cause of nosocomial respiratory tract infections
P. aeruginosa
What is the hemolytic on pseudomonas aeruginosa on sheep blood agar
Beta-hemolytic
What odor will Pseudomonas aeruginosa have
fruity, grapelike odor
True or false: Pseudomonas aeruginosa is resistant to many antimicrobial agents
True
Wrinkled, leathery, adherent colonies that may produce a light yellow or brown pig
P. stutzeri
A member of the family moraxellaceae
Acinetobacter
Has a purplish hue and may resemble of a lactose-fermenting bacterium
Acinetobacter
The third most common nonfermentative gram negative bacilius
Stenotrophomonas maltophilia
