Quick Answer: In The Kirby Bauer Method What Antibiotic Would Be Most Effective To Treat A Bacterial Infection?


How can you tell which antibiotic is most effective?

A quantitative method of susceptibility testing, an MIC helps determine which class of antibiotic is most effective. This information can lead to an appropriate choice of an antibiotic that will increase chances of treatment success and help in the fight to slow antibiotic resistance.

How does the Kirby-Bauer method work for testing the effectiveness of antibiotics?

In Kirby – Bauer testing, bacteria are placed on a plate of solid growth medium and wafers of antibiotics (white disks, shown) are added to the plate. After allowing the bacteria to grow overnight, areas of clear media surrounding the disks indicate that the antibiotic inhibits bacterial growth.

What is Kirby-Bauer antibiotic testing?

Kirby – Bauer antibiotic testing (also called KB testing or disk diffusion antibiotic sensitivity testing ) uses antibiotic -containing wafers or disks to test whether particular bacteria are susceptible to specific antibiotics. First, a pure culture of bacteria is isolated from the patient.

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What is the Kirby-Bauer method in susceptibility testing?

The Kirby – Bauer test, known as the disk-diffusion method, is the most widely used antibiotic susceptibility test in determining what choice of antibiotics should be used when treating an infection. This method relies on the inhibition of bacterial growth measured under standard conditions.

How do you test for antibiotic resistance?

The standard method for identifying drug resistance is to take a sample from a wound, blood or urine and expose resident bacteria to various drugs. If the bacterial colony continues to divide and thrive despite the presence of a normally effective drug, it indicates the microbes are drug- resistant.

What are two methods used to determine antibiotic susceptibility?

The broth dilution and disk diffusion techniques are the most commonly used methods of bacterial culture and antibiotic susceptibility testing in veterinary medicine. Both methods can be used to identify the likely pathogen involved in a bacterial infection and the antibiotic most likely to inhibit the bacteria.

What two factors increase the effectiveness of a disinfectant on microorganisms?

Several physical and chemical factors also influence disinfectant procedures: temperature, pH, relative humidity, and water hardness. For example, the activity of most disinfectants increases as the temperature increases, but some exceptions exist.

Who is affected by antibiotic resistance?

Antibiotic Resistance Threatens Everyone Each year in the U.S., at least 2.8 million people are infected with antibiotic – resistant bacteria or fungi, and more than 35,000 people die as a result.

Why Antibiotics target bacteria but not human cells?

Human cells do not make or need peptidoglycan. Penicillin, one of the first antibiotics to be used widely, prevents the final cross-linking step, or transpeptidation, in assembly of this macromolecule. The result is a very fragile cell wall that bursts, killing the bacterium.

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What are the advantages to using the Kirby Bauer method?

The microbroth dilution method has become more widely used due to its ability to become automated, however, the Kirby Bauer method may be able to detect subpopulations of resistant bacteria that would be visualized as inner colonies in the zone of diffusion.

What is a post antibiotic effect?

The term postantibiotic effect (PAE) refers to a period of time after complete removal of an antibiotic during which there is no growth of the target organism. The PAE appears to be a feature of most antimicrobial agents and has been documented with a variety of common bacterial pathogens.

What does it mean if there is no zone of inhibition?

A lack of visual zone does not mean the antimicrobial agent is ineffective: the zone of inhibition test requires the antimicrobial agent to migrate into the nutrient agar. If the antimicrobial is not compatible with the nutrient agar, it will not migrate to create a visual zone of inhibition.

What is the importance of doing antimicrobial susceptibility testing by disc diffusion?

Disk – diffusion susceptibility testing is most frequently used to measure the antimicrobial resistance of isolates of N. gonorrhoeae for patient management whereas determination of the minimal inhibitory concentration (MIC) is more appropriate for surveillance programs.

What format of media is used to perform the Kirby Bauer test?

The media used in Kirby – Bauer testing must be Mueller-Hinton agar at only 4 mm deep, poured into either 100 mm or 150 mm Petri dishes. The pH level of the agar must be between 7.2 and 7.4.

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Why is Mueller-Hinton agar used?

Mueller – Hinton agar is a microbiological growth medium that is commonly used for antibiotic susceptibility testing, specifically disk diffusion tests. It is also used to isolate and maintain Neisseria and Moraxella species.

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