Podcast
Questions and Answers
What is the purpose of rotating the Mueller-Hinton plate after each streaking?
What is the purpose of rotating the Mueller-Hinton plate after each streaking?
- To enhance the growth of all bacteria on the plate
- To create a uniform layer of culture across the surface (correct)
- To ensure complete drying of the agar surface
- To facilitate equal distribution of antibiotics later
Why should the antibiotic disk not be pressed into the agar during the dispensing process?
Why should the antibiotic disk not be pressed into the agar during the dispensing process?
- It enhances the effectiveness of the antibiotics
- It may lead to inaccurate measurement of inhibition zones (correct)
- It could cause the antibiotic to be absorbed improperly
- It can increase the spread of bacteria on the plate
What is the recommended temperature and time for incubating the agar plates?
What is the recommended temperature and time for incubating the agar plates?
- 40°C for 10 hours
- 35°C for 16-18 hours (correct)
- 25°C for 12 hours
- 30°C for 24 hours
What should be done before removing excess culture from the cotton swab?
What should be done before removing excess culture from the cotton swab?
How should the zones of inhibition be measured after the incubation period?
How should the zones of inhibition be measured after the incubation period?
What is the first step in the procedure prior to inoculating the agar plates?
What is the first step in the procedure prior to inoculating the agar plates?
What is the significance of allowing the culture to dry for 5-10 minutes at room temperature?
What is the significance of allowing the culture to dry for 5-10 minutes at room temperature?
During the antibacterial sensitivity analysis, what does a zone of inhibition indicate?
During the antibacterial sensitivity analysis, what does a zone of inhibition indicate?
Flashcards
Mueller-Hinton Agar
Mueller-Hinton Agar
A specific type of agar used for testing antimicrobial sensitivity, providing a standardized environment for bacterial growth. It is formulated with beef extract, casein hydrolysate, and starch, creating a nutrient-rich media that allows for the growth of many bacterial species.
Streaking Technique
Streaking Technique
The process of applying a uniform layer of bacteria onto the Mueller-Hinton agar surface. The swabbing should be done in a controlled manner to ensure even distribution of the bacteria for accurate results.
Zone of Inhibition
Zone of Inhibition
The clear area surrounding the antibiotic disk where bacteria cannot grow. The size of the zone indicates the effectiveness of the specific antibiotic against the bacteria.
Antibiotic Susceptibility Testing
Antibiotic Susceptibility Testing
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Dispensing Antibiotic Disks
Dispensing Antibiotic Disks
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Incubation Period
Incubation Period
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Measuring Zones of Inhibition
Measuring Zones of Inhibition
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Susceptibility Classification
Susceptibility Classification
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Study Notes
Antimicrobial Agent Use Procedure
- Mark each Mueller-Hinton agar plate with date and bacterium name.
- Use a separate sterile swab for each bacterium.
- Immerse swab in culture tube, squeeze excess culture.
- Streak swab across plate surface three times, rotating 60 degrees after each.
- Streak swab around agar edge to ensure complete seeding.
- Allow culture to dry for 5-10 minutes at room temperature.
- Dispense antibiotics, avoiding contact with culture.
- Use alcohol-flamed forceps to gently press disks onto agar.
- Do not press disks into agar or move them after placement.
- Incubate plates for 16-18 hours at 35°C.
- Do not invert plates during incubation.
- Measure zones of inhibition to nearest mm.
- Determine if bacteria are resistant or susceptible to each antibiotic.
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