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Questions and Answers
What is the main function of Indicator media in microbiology?
What is the main function of Indicator media in microbiology?
- To store bacterial cultures for future use
- To inhibit the growth of certain bacteria
- To change color indicating the presence of a specific substance (correct)
- To provide nutrients for bacterial growth
Which test is primarily used to differentiate between certain types of bacteria?
Which test is primarily used to differentiate between certain types of bacteria?
- IMViC test
- Coomb's test
- CAMP test (correct)
- Nagler's reaction
What characterizes strict anaerobes in microbiology?
What characterizes strict anaerobes in microbiology?
- They thrive in high oxygen environments
- They require the absence of oxygen to survive (correct)
- They can metabolize oxygen for energy
- They can survive with or without oxygen
Why is the Vi antigen significant in microbial identification?
Why is the Vi antigen significant in microbial identification?
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What are dermatophytes primarily responsible for?
What are dermatophytes primarily responsible for?
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Which microbe is associated with Weil's disease?
Which microbe is associated with Weil's disease?
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What does bacteriocin do in a microbial context?
What does bacteriocin do in a microbial context?
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What is the primary purpose of using Coomb's test in microbiology?
What is the primary purpose of using Coomb's test in microbiology?
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Study Notes
Bacterial Toxins
- Enterotoxins: Affect the intestines.
- Bacteriocins: Proteins that kill or inhibit other bacteria.
Bacterial Antigens
- Vi antigen: Used for bacterial identification.
- Somatic antigen: Located on the cell wall.
Testing
- Coombs' test: Detects antibodies in blood.
- Nagler's reaction: Identifies antibodies.
- IMViC test: Used to identify various bacteria.
- CAMP test: Differentiates bacteria.
Growth Media
- Indicator media: Changes color to indicate presence or absence of a substance or organism.
Miscellaneous
- Pyocynin: A pigment produced by some bacteria.
- Dermatophytes: Fungi that infect the skin.
- Strict anaerobes: Require the absence of oxygen to survive.
Matching
- Heart Water disease: Caused by Ehrlichia ruminatum.
- Pathogenic Staphylococci: Coagulase positive.
- Cord factor: Associated with Mycobacterium tuberculosis.
- Bacillus anthracis: Known for "Medusa head colony" formation.
- Weil's disease: Caused by Leptospira.
- Chronic mastitis: Often caused by Streptococcus agalactiae.
Reasoning
- Haemophilus organism: Does not grow on plain blood agar because it needs additional growth factors, like X factor (hematin) and V factor (NAD).
- Brucella abortus: Has a predilection for gravid uteri because it targets placental tissue.
- Leptospira: Urine samples are neutralized to protect lab workers as the organism can be infectious.
- MaConkey's Lactose agar: Selective because it inhibits the growth of Gram-positive bacteria.
- Anthrax suspected animals: Carcasses are not opened during postmortem to prevent the release of spores that can spread the disease.
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