What is meant by antimicrobial susceptibility quizlet?

Asked By: Ivania Suriyaprakash | Last Updated: 27th January, 2020
Category: medical health infectious diseases
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Antibiotic resistance - ability of bacteria and other microorganisms to resist the effects of an antibiotic. Antibiotic susceptibility - antimicrobial agents that would be most effective in treating the infection (Kirby-Bauer)

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Consequently, what is meant by antimicrobial susceptibility?

Susceptibility is a term used when microbe such as bacteria and fungi are unable to grow in the presence of one or more antimicrobial drugs. Susceptibility testing is performed on bacteria or fungi causing an individual's infection after they have been recovered in a culture of the specimen.

Additionally, are antibacterial agents useful in viral infections? Antibiotics are critical to the treatment of bacterial infections. Whereas antibiotics are designed to treat bacterial (not viral) infections, antibacterial products protect vulnerable patients from infectious disease-causing organisms. Neither are demonstrably useful in the healthy household.

In this regard, why are pure cultures used for antimicrobial susceptibility testing?

Susceptibility means not resistance to the microbes, but easily sensitive to the microbes or other agents. A pure cultures is used for antimicrobial susceptibility testing because a pure culture will give a more accurate measurement of how far the antibiotic interrupted the susceptibility of the microbes.

Would it be acceptable to use a mixed culture for this test?

Why? No, because if there was more than one microbe present, we would not be able to accurately determine the effect that the antimicrobial agent had on a M.O . Reaction of bacterial mixed cultures are unreliable and inaccurate.

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How do you test for antimicrobial susceptibility?

Testing methods
Tests for antibiotic sensitivity include: Kirby-Bauer method. Small wafers containing antibiotics are placed onto a plate upon which bacteria are growing. If the bacteria are sensitive to the antibiotic, a clear ring, or zone of inhibition, is seen around the wafer indicating poor growth.

What do susceptibility numbers mean?

The size of the growth-free zone determined whether the bacterium was considered to be susceptible, resistant, or intermediate to a particular antibiotic. The MIC number is the lowest concentration (in μg/mL) of an antibiotic that inhibits the growth of a given strain of bacteria.

What is culture and sensitivity test?

Culture and Sensitivity. A culture is a test to find germs (such as bacteria or a fungus) that can cause an infection. A sensitivity test checks to see what kind of medicine, such as an antibiotic, will work best to treat the illness or infection. If germs that can cause infection grow, the culture is positive.

What is sensitivity test?

A sensitivity analysis is a test that determines the “sensitivity” of bacteria to an antibiotic. It also determines the ability of the drug to kill the bacteria. The results from the test can help your doctor determine which drugs are likely to be most effective in treating your infection.

What is culture test?


A blood culture is a test that checks for foreign invaders like bacteria, yeast, and other microorganisms in your blood. Having these pathogens in your bloodstream can be a sign of a blood infection, a condition known as bacteremia. A positive blood culture means that you have bacteria in your blood.

What does I mean in culture and sensitivity?

Intermediate (i): The sensitivity of a bacterial strain to a given antibiotic is said to be intermediate when it is inhibited in vitro by a concentration of this drug that is associated with an uncertain therapeutic effect.

What is drug susceptibility testing?

Drug susceptibility testing means testing to find out if a person has got drug resistant TB. That means finding out which drugs the TB bacteria in their body are sensitive to.

What is antibiotic susceptibility test?

An antibiotic sensitivity (or susceptibility) test is done to help choose the antibiotic that will be most effective against the specific types of bacteria or fungus infecting an individual person. Infections caused by resistant bacteria or fungi are not cured by treatment with those antibiotics.

What is the purpose of antimicrobial susceptibility testing?

Antimicrobial susceptibility tests are used to determine which specific antibiotics a particular bacteria or fungus is sensitive to. Most often, this testing complements a Gram stain and culture, the results of which are obtained much sooner.

What factors affect the zone of inhibition?


Technical factors influencing the size of the zone in the disc diffusion method
  • Inoculum density.
  • Fig.
  • Table 14.
  • Timing of disc application.
  • Temperature of incubation.
  • Fig.
  • Incubation time.
  • Size of plate, depth of agar medium, and spacing of the antibiotic discs.

Why are tests conducted on microbes from a mixed culture unreliable and inconclusive?

Why are tests conducted on microbes from mixed culture unreliable and inconclusive? there are multiple unknown species in a mixed culture so it would be unwise to perform tests on them because the observer wouldn't be able to tell which specie is giving the specific result.

How do you deal with antibiotic resistance?

To help fight antibiotic resistance and protect yourself against infection:
  1. Don't take antibiotics unless you're certain you need them. An estimated 30% of the millions of prescriptions written each year are not needed.
  2. Finish your pills.
  3. Get vaccinated.
  4. Stay safe in the hospital.

What are the effects of antibiotic resistance?

Antibiotic resistance results in a decreased ability to treat infections and illnesses in people, animals and plants. This can lead to the following problems: increased human illness, suffering and death, increased cost and length of treatments, and.

What are three actions that could prevent antibiotic resistance?

There are many ways that drug-resistant infections can be prevented: immunization, safe food preparation, handwashing, and using antibiotics as directed and only when necessary. In addition, preventing infections also prevents the spread of resistant bacteria.

Can you reverse antibiotic resistance?


Yes, antibiotic resistance traits can be lost, but this reverse process occurs more slowly. If the selective pressure that is applied by the presence of an antibiotic is removed, the bacterial population can potentially revert to a population of bacteria that responds to antibiotics.

What causes antimicrobial resistance?

The main cause of antibiotic resistance is antibiotic use. When we use antibiotics, some bacteria die but resistant bacteria can survive and even multiply. The overuse of antibiotics makes resistant bacteria more common. The more we use antibiotics, the more chances bacteria have to become resistant to them.

How do antibiotics kill bacteria?

Antibiotics fight bacterial infections either by killing bacteria or slowing and suspending its growth. They do this by: attacking the wall or coating surrounding bacteria. interfering with bacteria reproduction.