Antimicrobial Agent Use Procedure Quiz

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Questions and Answers

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?

  • 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?

  • 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?

<p>Squeeze the swab against the inner side of the tube (A)</p>
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How should the zones of inhibition be measured after the incubation period?

<p>To the nearest mm for each antibiotic (C)</p>
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What is the first step in the procedure prior to inoculating the agar plates?

<p>Mark the lid with the date and the bacterium's name (D)</p>
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What is the significance of allowing the culture to dry for 5-10 minutes at room temperature?

<p>To prevent dilution of bacteria during antibiotic application (A)</p>
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During the antibacterial sensitivity analysis, what does a zone of inhibition indicate?

<p>Susceptibility of bacteria to the antibiotic (D)</p>
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Flashcards

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

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

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

The susceptibility of bacteria to a specific antibiotic is determined by measuring the zone of inhibition and comparing it to predetermined standards. The result will indicate if the bacterium is susceptible, intermediate, or resistant to the antibiotic.

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Dispensing Antibiotic Disks

The application of antibiotic disks onto the inoculated agar plate, ensuring the disks are properly placed at equal distances for uniform results.

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Incubation Period

The period of time the plates with antibiotic disks are incubated at a specific temperature to allow bacterial growth and the formation of zones of inhibition.

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Measuring Zones of Inhibition

The precise measurement of the zone of inhibition for each antibiotic disk, using millimeters as the unit of measurement. This data is crucial for determining the susceptibility of bacteria to specific antibiotics.

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Susceptibility Classification

The classification of bacteria based on their sensitivity to the antibiotic. Bacteria can be classified as "susceptible", "intermediate", or "resistant" depending on the size of the zone of inhibition.

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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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