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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.
What else can I help you with?
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.
Can streptococci grow in mueller hinton agar?
Yes, streptococci can grow on Mueller-Hinton agar, although it is not the optimal medium for their culture. Mueller-Hinton agar is primarily used for antimicrobial susceptibility testing and may not support the growth of all streptococcal species as well as other specialized media, such as blood agar, which provides the necessary nutrients and growth factors for these bacteria. However, some streptococcal species may still form colonies on Mueller-Hinton agar under appropriate conditions.
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.
Mueller-hinton agar is selective medium?
Mueller-Hinton agar is not a selective medium; rather, it is a non-selective, nutrient-rich agar used primarily for antibiotic susceptibility testing. It supports the growth of a wide variety of bacteria, particularly those relevant to clinical infections, such as Staphylococcus and Streptococcus species. Its composition allows for the reliable assessment of bacterial resistance and susceptibility to various antibiotics.
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.
Can streptococci grow in mueller hinton agar?
Yes, streptococci can grow on Mueller-Hinton agar, although it is not the optimal medium for their culture. Mueller-Hinton agar is primarily used for antimicrobial susceptibility testing and may not support the growth of all streptococcal species as well as other specialized media, such as blood agar, which provides the necessary nutrients and growth factors for these bacteria. However, some streptococcal species may still form colonies on Mueller-Hinton agar under appropriate conditions.
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.
Mueller-hinton agar is selective medium?
Mueller-Hinton agar is not a selective medium; rather, it is a non-selective, nutrient-rich agar used primarily for antibiotic susceptibility testing. It supports the growth of a wide variety of bacteria, particularly those relevant to clinical infections, such as Staphylococcus and Streptococcus species. Its composition allows for the reliable assessment of bacterial resistance and susceptibility to various antibiotics.
What happens when mueller hinton agar is too thick?
When Mueller Hinton agar is too thick, it can hinder the diffusion of antibiotics used in antimicrobial susceptibility testing. This can lead to inaccurate results, such as falsely elevated minimum inhibitory concentrations (MICs), making it difficult to determine the effectiveness of the antibiotic against the bacteria. Consequently, it may result in inappropriate treatment decisions. Proper agar thickness is crucial for reliable and consistent testing outcomes.
Where to buy Mueller-Hinton agar in Cebu Philippines?
In Cebu, Philippines, you can purchase Mueller-Hinton agar from local laboratory supply stores or scientific retailers. Additionally, larger pharmacies or medical supply companies may carry it. Online marketplaces such as Lazada or Shopee could also have listings for Mueller-Hinton agar. For specific recommendations, checking with local universities or research institutions may help identify reliable suppliers.
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.
