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The composition of the aerobic human vaginal microfloras has been extensively studied . These floras are dominated by lactobacilli; however, other aerobic bacteria may also be present, including Staphylococcus aureus. The bacterial density of S. aureus changes dramatically during menstruation, increasing logarithmically in the vagina compared to during nonmenses . A major end product of Lactobacillus metabolism, lactic acid, is responsible for maintaining the vaginal pH at approximately 4 at times other than menstruation. During menstruation, lactobacilli appear to be unable to maintain vaginal pH, and the rise in pH corresponds with rises in S. aureus levels.
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What agar is the best for staphylococcus aureus?
Mannitol Salt Agar (MSA) is commonly used for isolating Staphylococcus aureus because it contains high salt concentration which inhibits the growth of many other bacteria while allowing the growth of Staphylococcus species. Additionally, the fermentation of mannitol by S. aureus produces yellow colonies on MSA, aiding in its identification.
How can heavy growth of staphylococcus aureus be treated?
Heavy growth of Staphylococcus aureus can be treated with antibiotics such as penicillinase-resistant penicillins, cephalosporins, or vancomycin. It is important to consult a healthcare professional for proper diagnosis and treatment, as antibiotic resistance is a concern with Staphylococcus aureus infections. Additionally, addressing any underlying health conditions and maintaining good hygiene practices can help prevent recurrence.
Can staphylococcus aureus grow on Nutrient Agar?
Yes, Staphylococcus aureus can grow on Nutrient Agar, which is a general-purpose medium that supports the growth of a wide variety of bacteria, including Staphylococcus species. Staphylococcus aureus typically forms white to creamy colonies on Nutrient Agar.
What culture media is specific for Staphylococcus aureus?
Mannitol Salt Agar (MSA) is a selective and differential medium that is specific for Staphylococcus aureus. Staphylococcus aureus can ferment mannitol, leading to acid production that changes the pH indicator in the medium, causing yellow colonies to form. Additionally, the high salt concentration in MSA inhibits the growth of other bacteria, allowing for selective isolation of Staphylococcus aureus.
Is staphylococcus aureus a psychrophile?
No, Staphylococcus aureus is not a psychrophile. Psychrophiles are organisms that thrive in cold temperatures below 20°C. Staphylococcus aureus is generally mesophilic, meaning it grows best at moderate temperatures between 20-45°C.
What agar is the best for staphylococcus aureus?
Mannitol Salt Agar (MSA) is commonly used for isolating Staphylococcus aureus because it contains high salt concentration which inhibits the growth of many other bacteria while allowing the growth of Staphylococcus species. Additionally, the fermentation of mannitol by S. aureus produces yellow colonies on MSA, aiding in its identification.
How can heavy growth of staphylococcus aureus be treated?
Heavy growth of Staphylococcus aureus can be treated with antibiotics such as penicillinase-resistant penicillins, cephalosporins, or vancomycin. It is important to consult a healthcare professional for proper diagnosis and treatment, as antibiotic resistance is a concern with Staphylococcus aureus infections. Additionally, addressing any underlying health conditions and maintaining good hygiene practices can help prevent recurrence.
What is the doubling time for staphylococcus aureus?
The doubling time for Staphylococcus aureus can vary depending on factors such as the strain of the bacteria and the growth conditions. On average, it is estimated to be around 30-60 minutes in optimal conditions.
Can staphylococcus aureus grow on Nutrient Agar?
Yes, Staphylococcus aureus can grow on Nutrient Agar, which is a general-purpose medium that supports the growth of a wide variety of bacteria, including Staphylococcus species. Staphylococcus aureus typically forms white to creamy colonies on Nutrient Agar.
What culture media is specific for Staphylococcus aureus?
Mannitol Salt Agar (MSA) is a selective and differential medium that is specific for Staphylococcus aureus. Staphylococcus aureus can ferment mannitol, leading to acid production that changes the pH indicator in the medium, causing yellow colonies to form. Additionally, the high salt concentration in MSA inhibits the growth of other bacteria, allowing for selective isolation of Staphylococcus aureus.
What has the author Rachael Buck written?
Rachael Buck has written: 'The effect of wound dressings on growth and exotoxin production by Staphylococcus Aureus'
Is staphylococcus aureus a psychrophile?
No, Staphylococcus aureus is not a psychrophile. Psychrophiles are organisms that thrive in cold temperatures below 20°C. Staphylococcus aureus is generally mesophilic, meaning it grows best at moderate temperatures between 20-45°C.
Will s aureus grow on a crystal violet agar plate?
Staphylococcus aureus can grow on crystal violet agar plates as crystal violet agar is a selective medium that inhibits the growth of Gram-negative bacteria and allows the growth of Gram-positive bacteria like S. aureus.
What are the names of common aerobes?
Common aerobes include bacteria such as Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. These organisms require oxygen for growth and metabolism.
How do you different colony between bacillus subtilis and staphylococcus aureus in MYP agar?
Bacillus subtilis typically forms large, dry, irregular colonies with a matte appearance on MYP agar, while Staphylococcus aureus usually forms small, smooth, shiny colonies. Additionally, B. subtilis is often motile and may exhibit rhizoid growth patterns, while S. aureus is non-motile. A Gram stain can also be useful, as B. subtilis is Gram-positive and S. aureus is Gram-positive.
How is the growth on a plate if results show are positive for Staphylococcus aureus?
If growth on a plate shows positive results for Staphylococcus aureus, it typically indicates the presence of yellow or golden colonies, often surrounded by a clear zone due to the organism's ability to produce coagulase. The colonies may appear smooth and round, and they often produce a characteristic fruity or sweet odor. Additionally, if the medium is selective, such as mannitol salt agar, S. aureus will ferment mannitol, leading to a color change in the medium. Overall, positive growth suggests contamination or infection by this pathogen, which is significant in clinical settings.
Does Staphylococcus grow on non crystal violet MacConkey agar?
Staphylococcus will not grow on Mac since crystal violet inhibits the growth of Gram positivesfmchinea: Actually some species of staphylococcus grow on MacConkey's plate including Staphylococcus aureus.
