- 1 Which antimicrobial is used to suppress or kill Saprophytic molds in media?
- 2 Which one of the following organisms is sensitive to bacitracin?
- 3 Which bacterial species is most likely represented by the opaque chalky white colony appearance?
- 4 Why is chocolate agar used in throat culture quizlet?
- 5 Which of the following results is typical of Campylobacter jejuni?
- 6 What is alpha and beta hemolysis?
- 7 What is the bacitracin test used for?
- 8 How is bacitracin sensitivity tested for?
- 9 What is the role of Optochin sensitivity test?
- 10 How can colonies be used to identify bacteria?
- 11 What bacteria does not grow on blood agar?
- 12 Is E coli Gram positive or negative?
- 13 Why is blood agar used for throat cultures?
- 14 Why is a throat culture performed in the clinical setting quizlet?
- 15 What agar plate is used for a throat culture?
Which antimicrobial is used to suppress or kill Saprophytic molds in media?
Preanalytical and Susceptibility testing
|Anaerobic susceptibility testing is helpful in the management of patients with:||synovial infections|
|An antibiotic used to suppress or kill contaminating fungi in media is:||cycloheximide|
|Production of beta-lactmase is inducible in which organism:||Staphylococcus aureus|
Which one of the following organisms is sensitive to bacitracin?
Bacitracin can be used to distinguish Streptococcus pyogenes from other streptococci, with S. pyogenes being sensitive to bacitracin and others resistant. In this case bacitracin is used to distinguish S. pyogenes from other β-hemolytic streptococci.
Which bacterial species is most likely represented by the opaque chalky white colony appearance?
Nocardia and Mycobacterium species The colonies on blood and chocolate agar are often chalky white and dry (Fig. 26.5 right).
Why is chocolate agar used in throat culture quizlet?
Chocolate agar provides the nutrients required by N gonorrhoeae and selective media contains antimicrobial agents that inhibits other organisms and permits recovery of pathogenic Neisseria.
Which of the following results is typical of Campylobacter jejuni?
In most people who become ill with campylobacteriosis, symptoms develop within two to five days of exposure to the organism and illness typically lasts seven days following onset. Infection with C. jejuni usually results in enteritis, which is characterised by abdominal pain, diarrhea, fever, and malaise.
What is alpha and beta hemolysis?
Alpha hemolysis is a greenish discoloration that surrounds a bacterial colony growing on the agar. Beta hemolysis represents a complete breakdown of the hemoglobin of the red blood cells in the vicinity of a bacterial colony.
What is the bacitracin test used for?
The bacitracin susceptibility test is used to distinguish Group A streptococci, from other streptococci. When grown on blood agar, Group A streptococci are sensitive to (killed by) the antibiotic bacitracin.
How is bacitracin sensitivity tested for?
Method. Using an inoculating loop, streak two or three suspected colonies of a pure culture onto a blood agar plate. Using heated forceps, place a bacitracin disk in the first quadrant (area of heaviest growth). Gently tap the disk to ensure adequate contact with the agar surface.
What is the role of Optochin sensitivity test?
This test determines whether the bacterium is either sensitive (susceptible) to optochin or resistant to the chemical. The optochin test is widely used in the form of filter paper discs, impregnated with ethylhydrocupreine hydrochloride, which are applied directly to inoculated plates before incubation.
How can colonies be used to identify bacteria?
Colony morphology is a method that scientists use to describe the characteristics of an individual colony of bacteria growing on agar in a Petri dish. It can be used to help to identify them. A swab from a bin spread directly onto nutrient agar. Colonies differ in their shape, size, colour and texture.
What bacteria does not grow on blood agar?
Fastidious organisms, such as streptococci, do not grow well on ordinary growth media but grow on blood agar.
Is E coli Gram positive or negative?
Escherichia coli ( E. coli ) is a Gram – negative, rod-shaped, facultative anaerobic bacterium.
Why is blood agar used for throat cultures?
Blood agar is commonly used to isolate not only streptococci, but also staphylococci and many other pathogens. Besides providing enrichments for the growth of fastidious pathogens, Blood agar can be used to detect hemolytic properties.
Why is a throat culture performed in the clinical setting quizlet?
Terms in this set (20) Throat culture allows growth of infectious (bacterial or fungal) agents. Most common bacterial cause of bacterial ( strep ) pharyngitis?
What agar plate is used for a throat culture?
When strep is suspected, the throat material is cultured on blood agar that has been prepared as a broth and poured into petri dishes ( plates ) where it solidifies into a gel. Blood agar is usually made from the cell walls of red algae (also trypticase soy, heart infusion, or Todd-Hewitt agar ) and sheep’s blood.