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Better diffusion of antibiotics is just one reason why MHA is used for antibiotic sensitivity test (ABST). There are several factors that affect the ABST, they are: Disc concentration, diffusability of the drug, nature and composition of the medium, thickness of the medium, pH of the medium, potency of the disc. The pH should be between 7.2 and 7.4. If the pH is too low, certain drugs loose potency (eg. aminoglycosides, quinolones and macrolides) while certain others show excess activity (eg. tetracycline). If the pH is too high then reverse reactions would occur. Excess moisture too affects the reliability of the result. Increased thymidine reverses the inhibitory effect of sulphonamides, MHA has decreased thymidine content. Increased con. of Mg 2+ and Ca 2+ affects the results of aminoglycosides and tetracycline, also reduces zone size in case of P. aeruginosa. Decreased cation increases the zone size. Increased Zn would decrease the zone size of carbapenen group of antibiotics. Some fastedious organisms like Haemophilus sp, N.gonorrheae, S. pneumoniae, S. viridans and beta hemolytic Streptococcusrequire MHA supplemented with 15micro gram per ml NAD, bovine hematin and yeast extract.

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Is Mueller Hinton agar is selective media?

No, Mueller Hinton agar is not a selective media. It is a non-selective media that is commonly used for antibiotic susceptibility testing of bacterial isolates.


Why not nutrient agar for antibiotic sensitivity test?

Nutrient agar is a general-purpose medium with undefined composition, which can contain various nutrients that may interfere with antibiotic sensitivity testing. Mueller-Hinton agar is specifically designed to support the growth of a wide range of bacteria and maintain a consistent pH, making it more reliable for antibiotic sensitivity testing.


Why mueller Hinton agar used instead of TSA?

Mueller Hinton agar is used for antibiotic susceptibility testing because it has a consistent pH and low calcium and magnesium content, reducing the likelihood of interference with the antibiotics being tested. TSA (tryptic soy agar) may contain higher levels of these elements and can affect the results of antibiotic susceptibility testing.


Why Mueller-Hinton agar should be free of visible moisture?

Mueller-Hinton agar should be free of visible moisture because excess moisture can lead to uneven distribution of antibiotics and altered diffusion rates, affecting the accuracy of susceptibility testing results. Additionally, moisture can create a conducive environment for bacterial overgrowth and contamination, compromising the reliability of the test results.


Why have zone inhibition?

It is the area on an agar plate where growth of a control organism is prevented by an antibiotic usually placed on the agar surface. If the test organism is susceptable to the antibiotic, it will not grow where the antibioitic is.

Related Questions

What is the difference between Kirby-Bauer and mueller-hinton?

Kirby-Bauer is the diffusion method you would use to test antibiotic sensitivity. The Mueller-Hinton is the agar plate in which you would do the method on. This is where the antibiotic discs would be places to test the sensitivity.


How did the Mueller-Hinton get its name?

The Mueller-Hinton agar was named after John Hinton and Jane Hinton, who developed this medium in 1941 as a suitable medium for the standardized antimicrobial susceptibility testing. The Mueller-Hinton agar is still widely used today for antibiotic susceptibility testing.


Is Mueller Hinton agar is selective media?

No, Mueller Hinton agar is not a selective media. It is a non-selective media that is commonly used for antibiotic susceptibility testing of bacterial isolates.


Why not nutrient agar for antibiotic sensitivity test?

Nutrient agar is a general-purpose medium with undefined composition, which can contain various nutrients that may interfere with antibiotic sensitivity testing. Mueller-Hinton agar is specifically designed to support the growth of a wide range of bacteria and maintain a consistent pH, making it more reliable for antibiotic sensitivity testing.


Does streptococcus pneumoniae grow in Mueller Hinton agar?

It grows in Mueller-Hinton Broth Agar, with 5% CO2, at 25-37 °C


Why is Mueller Hinton agar used in microbiology testing?

Mueller Hinton agar is used in microbiology testing because it provides a consistent and standardized medium for the growth of bacteria. Its composition allows for accurate testing of antibiotic susceptibility, making it a reliable tool for determining the effectiveness of antibiotics against different bacterial strains.


Why mueller Hinton agar used instead of TSA?

Mueller Hinton agar is used for antibiotic susceptibility testing because it has a consistent pH and low calcium and magnesium content, reducing the likelihood of interference with the antibiotics being tested. TSA (tryptic soy agar) may contain higher levels of these elements and can affect the results of antibiotic susceptibility testing.


Why Mueller-Hinton agar should be free of visible moisture?

Mueller-Hinton agar should be free of visible moisture because excess moisture can lead to uneven distribution of antibiotics and altered diffusion rates, affecting the accuracy of susceptibility testing results. Additionally, moisture can create a conducive environment for bacterial overgrowth and contamination, compromising the reliability of the test results.


What specific medium must be use in testing the effectiveness of antibiotics?

A growth medium must be used. The most common is Mueller-Hinton agar, but potato dextrose agar or other growth media could also be used.


a.Why is Muller Hinton agar used in experiment described in lab lesson H instead of TSA?

. If Muller hinton agar is poured very thin , what would be the probable result wrt zone size?


Why have zone inhibition?

It is the area on an agar plate where growth of a control organism is prevented by an antibiotic usually placed on the agar surface. If the test organism is susceptable to the antibiotic, it will not grow where the antibioitic is.


What is the difference between nutrient agar culture media and MacConkey agar culture media?

nutrient agar is used generally for culturing any organism.But Muller hinton agar is specifically used for testing antibiotic sensitivity as it does not contain any inhibitory substances for the growh of the organism