WorksheetsAST & Mechanisms Quiz
Total questions: 22
Worksheet time: 23mins
A standardized inoculum of bacteria (usually 0.5Mcf) is dabbed onto the surface of a dish of Mueller-Hinton (MH) agar. Filter paper discs impregnated with antimicrobial agents are placed on the agar. After overnight incubation, the diameter of the zone of inhibition is measured around each disc.
1st Statement is true.
2nd Statement is true.
Both Statements are true.
Both Statements are false.
To determine whether the bacterial isolate is capable of expressing resistance to the antimicrobial agents selected for treatment is the _____________ of AST.
Primary Purpose
Primary Goal
Principle
Primary Objective
The purpose of AST is to guide the clinician in selecting appropriate causative agent. To gather epidemiological data on microbial resistance.
First Statement is true.
Second Statement is true.
Both Statements are true.
Both Statements are false.
All of the following are the reason/s for standardization of AST, except:
To optimize bacterial growth conditions
To optimize conditions for maintaining antimicrobial integrity and activity
To maintain reproducibility and consistency in the resistance profile
None of the choices
DISK DIFFUSION Method is also known as (a) .
Medium used in Disk Diffusion Method.
(a)
Composition of 0.5 McFarland Standard.
(a)
Standard inoculum of AST.
(a)
pH of the medium for AST.
(a)
Depth of the agar for AST.
(a)
All of the following are factors affecting disk diffusion, except:
Thickness of the agar
Amount of inoculum
pH of the media
None of the choices
The distance between 12 discs.
(a)
All of the following are condition/s that can cause false sensitive results of AST, except:
Thick medium
Decrease organisms
Increase drying
None of the choices
This term refers to "no zone or small zone of inhibition".
(a)
Provide microorganisms with the capacity to avoid host defenses and damage host cells, tissues and organs in a number of ways.
(a)
Match the following:
Glycocalyx
Streptococcus mutans
M protein
Streptococcus pyogenes
Opa protein
Streptococcus pyogenes
Tapered end
Treponema pallidum
Coagulase
Coagulate blood
Kinase
Digest fibrin clots
Hyaluronidase
Hydrolyses hyaluronic acid
Collagenase
Hydrolyses hyaluronic acid
Match the following:
Toxigenicity
ability to produce toxins
Toxemia
presence of toxin in host’s blood
Antitoxin
antibodies against a specific toxin
They are part of the outer portion of the cell wall of gram negative bacteria. They are liberated when the bacteria die and the cell wall breaks apart.
(a)
This term refers "development of disease".
(a)
This refers to microbes that are present for various periods then disappear.
(a)
This refers to "pathogens limited to a small area of the body".
(a)
