Infectious Disease Exam 1

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  • 1/144 Questions

    Most common causative agent of the system infection, infective (septic) arthritis?

    • S. aureus
    • S. epidermidis
    • S. saprophyticus
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Bacteriology Quizzes & Trivia
About This Quiz

Infectious Disease Exam 1 focuses on the characteristics of Staphylococcus saprophyticus, contrasting it with other species like S. Aureus. It assesses knowledge on hemolysis patterns, coagulase, DNase activity, and mannitol fermentation, crucial for medical and microbiological education.

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  • 2. 

    Which causes the systemic infection post-viral lobar pneumonia

    • S. aureus

    • S. epidermidis

    • S. saphrophyticus

    Correct Answer
    A. S. aureus
    Explanation
    S. aureus is the correct answer because it is a common cause of systemic infection following lobar pneumonia. This bacterium is often found in the respiratory tract and can cause pneumonia, which can then lead to a systemic infection if it spreads beyond the lungs. S. epidermidis and S. saphrophyticus are not typically associated with causing systemic infections following lobar pneumonia.

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  • 3. 

    Most common causative agent of the systemic infection, bacteremia and sepsis (pyemia)

    • S. aureus

    • S. epidermidis

    • S. saprophyticus

    Correct Answer
    A. S. aureus
    Explanation
    S. aureus is the most common causative agent of systemic infections such as bacteremia and sepsis (pyemia). This bacterium is a common pathogen that can cause a wide range of infections in various parts of the body. It is known for its ability to produce toxins and evade the immune system, leading to severe infections. S. aureus is often found on the skin and nasal passages of healthy individuals but can cause serious infections when it enters the bloodstream or other tissues.

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  • 4. 

    Cystitis is

    • Upper UTI

    • Lower UTI

    Correct Answer
    A. Lower UTI
    Explanation
    Cystitis refers to the inflammation of the bladder, which is commonly caused by a bacterial infection. It typically presents with symptoms such as frequent urination, a strong urge to urinate, and a burning sensation during urination. Cystitis is classified as a lower urinary tract infection (UTI) because it primarily affects the bladder. Upper UTIs, on the other hand, involve the kidneys and are usually more severe. Therefore, the correct answer is lower UTI.

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  • 5. 

    Are Strep Gram positive or negative?

    • Positive

    • Negative

    Correct Answer
    A. Positive
    Explanation
    Strep bacteria are Gram-positive. This means that they retain the crystal violet stain in the Gram staining process, appearing purple under a microscope. Gram-positive bacteria have a thick peptidoglycan layer in their cell walls, which retains the stain. In contrast, Gram-negative bacteria do not retain the stain and appear pink or red.

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  • 6. 

    Staphylococcus

    • Grape-like clusters

    • Long chains

    Correct Answer
    A. Grape-like clusters
    Explanation
    Staphylococcus is a type of bacteria that is known for its characteristic arrangement in grape-like clusters. This arrangement is due to the bacteria dividing in multiple planes and remaining attached to each other. In contrast, bacteria that form long chains typically belong to the genus Streptococcus. Therefore, the given correct answer of "grape-like clusters" accurately describes the arrangement of Staphylococcus bacteria.

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  • 7. 

    Beta-hemolytic

    • S. aureus

    • S. epidermidis

    • S. saprophyticus

    Correct Answer
    A. S. aureus
    Explanation
    The correct answer is S. aureus because it is the only bacterium listed that is beta-hemolytic. Beta-hemolysis refers to the complete lysis of red blood cells, resulting in a clear zone around bacterial colonies on blood agar plates. S. epidermidis and S. saprophyticus are both coagulase-negative staphylococci and are not known to exhibit beta-hemolysis. Therefore, S. aureus is the most likely bacterium to be beta-hemolytic among the options provided.

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  • 8. 

    Systemic infection of S. aureus due to highly absorbent tampons

    • Toxic shock syndrome

    • Osteomyelitis

    • Infective (septic) arthritis

    • Post-viral lobar pneumonia

    Correct Answer
    A. Toxic shock syndrome
    Explanation
    Toxic shock syndrome is a rare but serious condition caused by a bacterial infection, often associated with the use of highly absorbent tampons. In this case, the systemic infection of S. aureus, a type of bacteria, is the cause of toxic shock syndrome. This condition can lead to symptoms such as high fever, rash, low blood pressure, and organ failure. It is important to seek medical attention immediately if toxic shock syndrome is suspected, as it can be life-threatening.

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  • 9. 

    S. aureus resistant to methicillin (Methicillin Resistant Staph Aureus MRSA) treated with 

    • Penicillin

    • Methicillin

    • Vancomycin

    • Bacitracin

    Correct Answer
    A. Vancomycin
    Explanation
    Vancomycin is the correct answer because it is known to be effective against methicillin-resistant Staphylococcus aureus (MRSA). MRSA is a type of bacteria that has developed resistance to many antibiotics, including methicillin. Vancomycin is often considered the drug of choice for treating MRSA infections due to its effectiveness against this particular strain of bacteria. Penicillin, methicillin, and bacitracin are not effective against MRSA, as they are susceptible to resistance mechanisms developed by the bacteria.

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  • 10. 

    In pustulent or necrotic tissues due to S. aureus infection, what treatment?

    • Bacitracin Cream

    • Bacitracin Ointment

    • Surgical debridement

    Correct Answer
    A. Surgical debridement
    Explanation
    In cases of pustulent or necrotic tissues caused by a Staphylococcus aureus infection, surgical debridement is the appropriate treatment. Surgical debridement involves the removal of infected or dead tissue to promote healing and prevent the spread of infection. Bacitracin cream or ointment may be used as adjunctive therapy to prevent secondary infection, but they alone would not be sufficient to treat the underlying infection and remove the necrotic tissue. Therefore, surgical debridement is the correct answer.

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  • 11. 

    The urease produced by ________ may mediate host pathogenesis.

    • S. aureus

    • S. epidermidis

    • S. saprophyticus

    • S. pyogenes

    Correct Answer
    A. S. saprophyticus
    Explanation
    S. saprophyticus may produce urease, which can play a role in causing disease in the host. Urease is an enzyme that breaks down urea into ammonia and carbon dioxide. This can lead to the formation of alkaline conditions in the host's urinary tract, which can be detrimental to the host and contribute to pathogenesis.

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  • 12. 

    Yellow-golden colored, round shape

    • S. aureus

    • S. epidermidis

    • S. saprophyticus

    Correct Answer
    A. S. aureus
    Explanation
    The correct answer is S. aureus because it is the only bacterium among the options that is commonly associated with a yellow-golden color and round shape. S. epidermidis and S. saprophyticus do not typically exhibit these characteristics.

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  • 13. 

    S. aureus

    • DNase positive

    • DNase negative

    Correct Answer
    A. DNase positive
    Explanation
    The given correct answer is "DNase positive". This means that the bacterium Staphylococcus aureus produces the enzyme DNase, which is capable of breaking down DNA. This trait is important in distinguishing S. aureus from other bacteria, as not all bacteria have the ability to produce DNase.

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  • 14. 

    Which is the most common causative agent of the systemic infection, acute bacterial endocarditis?

    • S. aureus

    • S. epidermidis

    • S. saprophyticus

    Correct Answer
    A. S. aureus
    Explanation
    S. aureus is the most common causative agent of acute bacterial endocarditis, a systemic infection. This bacterium is known for its ability to cause a wide range of infections, including endocarditis, which is an infection of the inner lining of the heart. S. aureus is a particularly virulent pathogen, capable of causing severe infections and complications. It is often found in the normal flora of the skin and nasal passages, making it easily accessible to enter the bloodstream and infect the heart valves.

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  • 15. 

    Causes the sytemic infection Staphylococcal Colitis (Necrotizing enterocolitis)

    • S. aureus

    • S. epidermidis

    • S. saprophyticus

    Correct Answer
    A. S. aureus
    Explanation
    S. aureus is the correct answer because it is a known cause of Staphylococcal Colitis, also known as Necrotizing enterocolitis. This infection is characterized by inflammation and necrosis of the intestinal mucosa, which can lead to severe complications. S. epidermidis and S. saprophyticus are not typically associated with this specific infection.

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  • 16. 

    Staph epidermidis is part of normal flora

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Staph epidermidis is considered part of the normal flora because it is commonly found on the skin and mucous membranes of healthy individuals. It is a commensal bacterium that does not typically cause harm or infection in healthy individuals. This bacterium plays a role in maintaining the balance of the skin microbiome and can provide protection against pathogenic organisms. Therefore, the statement that Staph epidermidis is part of the normal flora is true.

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  • 17. 

    S. aureus 

    • Coagulase positive

    • Coagulase negative

    Correct Answer
    A. Coagulase positive
    Explanation
    Coagulase positive refers to the ability of the bacterium Staphylococcus aureus to produce the enzyme coagulase. Coagulase is responsible for clotting blood plasma, which helps the bacteria evade the immune system by forming a protective barrier around itself. This characteristic is important in distinguishing S. aureus from other staphylococci that are coagulase negative.

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  • 18. 

    Can contaminated food carry S. aureus?

    • Yes

    • No

    Correct Answer
    A. Yes
    Explanation
    Contaminated food can carry S. aureus because this bacterium is commonly found in the nose and skin of healthy individuals. If proper food handling and hygiene practices are not followed, S. aureus can be transferred to food and cause contamination. Consuming contaminated food can lead to food poisoning symptoms such as nausea, vomiting, and diarrhea. Therefore, it is important to ensure that food is properly cooked, stored, and handled to prevent the growth and spread of S. aureus.

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  • 19. 

    Which organism infects both normal and damaged heart valves?

    • S. aureus

    • S. epidermidis

    • S. saprophyticus

    Correct Answer
    A. S. aureus
    Explanation
    S. aureus is the correct answer because it is a type of bacteria that can infect both normal and damaged heart valves. This bacterium is known to cause endocarditis, which is an infection of the inner lining of the heart and heart valves. S. aureus can attach to damaged heart valves and form a biofilm, making it difficult to treat and leading to serious complications. It can also infect normal heart valves, although this is less common.

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  • 20. 

    For dry foot lesions caused by S. aureus, use

    • Bacitracin Cream

    • Bacitracin Ointment

    • Surgical debridement

    Correct Answer
    A. Bacitracin Ointment
    Explanation
    Bacitracin ointment is the recommended treatment for dry foot lesions caused by S. aureus. Bacitracin is an antibiotic that works by stopping the growth of bacteria. It is commonly used to treat skin infections, including those caused by S. aureus. The ointment form of Bacitracin is preferred for dry foot lesions as it provides a protective barrier and keeps the affected area moisturized. Surgical debridement may be necessary in severe cases where there is extensive tissue damage or if the infection does not respond to antibiotic treatment.

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  • 21. 

    How are saprophyticus and epidermidis different from aureus in terms of coagulase and DNase?

    • All are the same

    • Sapro and epidermidis are both positive

    • Aureus is positive

    Correct Answer
    A. Aureus is positive
    Explanation
    The correct answer is that aureus is positive. This means that Staphylococcus aureus produces coagulase and DNase enzymes, while Staphylococcus saprophyticus and Staphylococcus epidermidis do not produce these enzymes. Coagulase is an enzyme that causes blood to clot, while DNase is an enzyme that breaks down DNA. This difference in enzyme production is one way to distinguish between these three species of Staphylococcus bacteria.

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  • 22. 

    Staphylococcus

    • Gram positive

    • Gram negative

    Correct Answer
    A. Gram positive
    Explanation
    Staphylococcus is a genus of bacteria that is known to be Gram positive. This means that when stained with the Gram stain, these bacteria retain the purple color, indicating that they have a thick peptidoglycan layer in their cell wall. Gram positive bacteria are generally more susceptible to certain antibiotics and are often associated with infections such as skin and soft tissue infections, as well as some types of pneumonia.

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  • 23. 

    Most common causative agent of the systemic infection Osteomyelitis

    • S. aureus

    • S. epidermidis

    • S. saprophyticus

    Correct Answer
    A. S. aureus
    Explanation
    S. aureus is the most common causative agent of the systemic infection Osteomyelitis. This bacterium is a common pathogen that can cause various infections in different parts of the body, including bones. It has the ability to invade and infect the bone, leading to inflammation and destruction of bone tissue. Other organisms like S. epidermidis and S. saprophyticus can also cause osteomyelitis, but they are less common compared to S. aureus.

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  • 24. 

    Linezolid (Zyvox) and Synercid are two drugs that treat MRSA. How?

    • Protein synthesis inhibitors

    • AA synthesis inhibitors

    Correct Answer
    A. Protein synthesis inhibitors
    Explanation
    Linezolid (Zyvox) and Synercid are both drugs that belong to the class of antibiotics known as protein synthesis inhibitors. These drugs work by inhibiting the synthesis of proteins in bacteria, including MRSA (methicillin-resistant Staphylococcus aureus). By targeting the bacterial protein synthesis machinery, Linezolid and Synercid effectively prevent the bacteria from producing essential proteins needed for their growth and survival. This ultimately leads to the death of the MRSA bacteria and helps in treating the infection caused by these resistant strains.

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  • 25. 

    The following applies to which Streptolysin of Streptococcus pyogenes? An increase in antibody titer is used to determine if individual had recent S. pyogenes infection

    • SLO

    • SLS

    Correct Answer
    A. SLO
    Explanation
    An increase in antibody titer is used to determine if an individual had a recent Streptococcus pyogenes infection. SLO (Streptolysin O) is a hemolysin produced by Streptococcus pyogenes that is responsible for the lysis of red blood cells. Antibodies against SLO are produced by the immune system in response to an infection with Streptococcus pyogenes. Therefore, an increase in antibody titer against SLO indicates a recent infection with Streptococcus pyogenes.

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  • 26. 

    Pyelonephritis is 

    • Upper UTI

    • Lower UTI

    Correct Answer
    A. Upper UTI
    Explanation
    Pyelonephritis is an infection that affects the kidneys, specifically the renal pelvis and the kidney tissue. It is considered an upper urinary tract infection (UTI) because it involves the upper part of the urinary system, which includes the kidneys and the ureters. Lower UTIs, on the other hand, involve the lower part of the urinary system, such as the bladder and the urethra. Therefore, the correct answer is Upper UTI.

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  • 27. 

    Staphylococcus

    • Catalase (peroxidase) Positive

    • Catalase (peroxidase) Negative

    Correct Answer
    A. Catalase (peroxidase) Positive
    Explanation
    Staphylococcus is a genus of bacteria that includes several species. The given information states that Staphylococcus is "Catalase (peroxidase) Positive." This means that the bacteria produce the enzyme catalase, which helps in breaking down hydrogen peroxide into water and oxygen. This characteristic is useful in differentiating Staphylococcus from other bacteria that are catalase negative.

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  • 28. 

    All of the following are localized infections produced by S. aureus except

    • Impetigo

    • Shingles

    • Cellulitis

    • Folliculitis

    • Furuncles and carbuncles

    Correct Answer
    A. Shingles
    Explanation
    Shingles is caused by the varicella-zoster virus, not by S. aureus. It is a viral infection that affects the nerve roots and causes a painful rash. The other options, impetigo, cellulitis, folliculitis, and furuncles and carbuncles, are all localized infections that can be caused by S. aureus.

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  • 29. 

    Streptolysin O (SLO)

    • Immunogenic

    • Non-immunogenic

    Correct Answer
    A. Immunogenic
    Explanation
    Streptolysin O (SLO) is considered immunogenic because it is capable of eliciting an immune response in the body. This means that when SLO enters the body, the immune system recognizes it as foreign and mounts a response to eliminate it. This immune response may involve the production of antibodies specific to SLO, as well as the activation of immune cells to destroy the pathogen. Therefore, SLO is immunogenic because it can stimulate an immune response.

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  • 30. 

    Systemic infection caused by S. aureus in which inhalation can lead to pneumonia, pulmonary abvesses or necrosis of host cells in bronchial tree or any lung cavity

    • Osteomyelitis

    • Infective (septic) arthritis

    • Acute bacterial endocarditis

    • Post-viral lobar pneumonia

    • Pyemia

    Correct Answer
    A. Post-viral lobar pneumonia
    Explanation
    Post-viral lobar pneumonia is the most appropriate explanation for the given correct answer. Post-viral lobar pneumonia refers to a type of pneumonia that occurs after a viral infection, such as influenza or respiratory syncytial virus (RSV). In this case, the systemic infection caused by S. aureus can lead to pneumonia, pulmonary abscesses, or necrosis of host cells in the bronchial tree or any lung cavity. This aligns with the concept of post-viral lobar pneumonia, which is characterized by inflammation and infection in the lung tissue following a viral infection.

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  • 31. 

    Streptococci have what cell arrangement? 

    • Grape-like cluster

    • Chain-like

    Correct Answer
    A. Chain-like
    Explanation
    Streptococci have a chain-like cell arrangement. This means that the cells are arranged in a linear fashion, resembling a chain. This arrangement is characteristic of streptococci bacteria and distinguishes them from other bacteria that may have different cell arrangements, such as grape-like clusters.

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  • 32. 

    Which is sub-grouped based on the Lancefield Groupings (A-H, K-M, O-V) based on the C carbohydrate extracted from the cell wall with hot HCl treatment?

    • Staphylococcus

    • Streptococcus

    • Clostridium

    Correct Answer
    A. Streptococcus
    Explanation
    Streptococcus is sub-grouped based on the Lancefield Groupings (A-H, K-M, O-V) based on the C carbohydrate extracted from the cell wall with hot HCl treatment.

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  • 33. 

    Sugar fermentation and esculin hydrolysis are the biotyping/biochemical properties of 

    • Staphylococcus

    • Streptococcus

    • Bacillus

    Correct Answer
    A. Streptococcus
    Explanation
    Sugar fermentation and esculin hydrolysis are two specific biochemical properties that are characteristic of Streptococcus bacteria. Streptococcus species are known to ferment sugars, meaning they can break down sugars for energy production. Additionally, they are also capable of hydrolyzing esculin, a compound found in certain plants, into glucose and esculetin. These properties are useful in differentiating Streptococcus from other bacterial genera, such as Staphylococcus and Bacillus, which may not exhibit the same fermentation or hydrolysis capabilities.

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  • 34. 

    S. aureus

    • Mannitol positive

    • Mannitol negative

    Correct Answer
    A. Mannitol positive
    Explanation
    The given correct answer suggests that S. aureus is Mannitol positive. This means that S. aureus can ferment mannitol, a type of sugar, and produce acid as a byproduct. This characteristic is often used in the laboratory to differentiate S. aureus from other bacteria.

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  • 35. 

    How are both Staph saprophyticus and Staph epidermidis different from S. aureus in terms of hemolysis pattern?

    • Saprophyticus and epidermidis do beta, while aureus does gamma

    • Saprophyticus and epidermidis do gamma, while aureus does beta

    • Saprophyticus and aureus do beta, while epidermidis does gamma

    • Saprophyticus and aureus do gamma, while epidermidis does beta

    Correct Answer
    A. Saprophyticus and epidermidis do gamma, while aureus does beta
    Explanation
    Staph saprophyticus and Staph epidermidis both exhibit gamma hemolysis, while Staph aureus displays beta hemolysis.

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  • 36. 

    Which staph can cause both pyelonephritis and cystitis?

    • Aureus

    • Epidermidis

    • Saprophyticus

    • Pyogenes

    Correct Answer
    A. Saprophyticus
    Explanation
    Staphylococcus saprophyticus can cause both pyelonephritis and cystitis. This bacterium is commonly associated with urinary tract infections, particularly in young sexually active women. It has the ability to adhere to the urinary tract lining and cause inflammation in both the kidneys (pyelonephritis) and the bladder (cystitis). Staphylococcus aureus, epidermidis, and pyogenes are not typically associated with urinary tract infections.

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  • 37. 

    Toxin A and B, which are exotoxins of S. aureus, are what kind of exotoxins?

    • Cytotoxins

    • Enterotoxins

    Correct Answer
    A. Enterotoxins
    Explanation
    Toxin A and B, exotoxins of S. aureus, are classified as enterotoxins. Enterotoxins are toxins that primarily affect the gastrointestinal system, causing symptoms such as vomiting and diarrhea. These toxins are produced by certain bacteria, including S. aureus, and are typically ingested through contaminated food or water. In the case of S. aureus, enterotoxins are responsible for food poisoning, as they are heat-stable and can withstand cooking temperatures.

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  • 38. 

    S. epidermidis systemic infections have what origin?

    • Grocery Stores

    • Toilet seats

    • Hospitals

    • Restaurants

    Correct Answer
    A. Hospitals
    Explanation
    S. epidermidis systemic infections have their origin in hospitals. Hospitals provide an environment that is conducive to the growth and spread of S. epidermidis bacteria, which can cause systemic infections. Factors such as close proximity of patients, compromised immune systems, invasive medical procedures, and the presence of medical devices make hospitals a common source of S. epidermidis infections.

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  • 39. 

    Is Staph saprophyticus coagulase negative or positive?

    • Positive

    • Negative

    Correct Answer
    A. Negative
    Explanation
    Staphylococcus saprophyticus is a coagulase-negative bacterium. Coagulase is an enzyme produced by some Staphylococcus species, such as Staphylococcus aureus, which causes the plasma protein fibrinogen to clot. Since Staphylococcus saprophyticus does not produce coagulase, it is classified as coagulase-negative.

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  • 40. 

    Pyruria (Pus in the urine) is commonly due to which Staph?

    • Aureus

    • Epidermidis

    • Saprophyticus

    • Pyogenes

    Correct Answer
    A. Saprophyticus
    Explanation
    Pyruria, which is the presence of pus in the urine, is commonly caused by Staphylococcus saprophyticus. This bacterium is a common cause of urinary tract infections, particularly in young sexually active women. Staphylococcus aureus is more commonly associated with skin and soft tissue infections, while Staphylococcus epidermidis is a common cause of infections related to medical devices. Staphylococcus pyogenes, also known as Group A Streptococcus, is not a Staphylococcus species and is not typically associated with pyruria.

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  • 41. 

    Halophilic (halotolerant); will grow in presence of 7.5% NaCl

    • Staphylococcus

    • Streptococcus

    Correct Answer
    A. Staphylococcus
    Explanation
    Staphylococcus is the correct answer because it is a halophilic (halotolerant) bacterium that can tolerate and grow in the presence of 7.5% NaCl. This means that Staphylococcus can survive and thrive in high salt concentrations, making it well-adapted to environments with high salt content such as the skin and mucous membranes. Streptococcus, on the other hand, is not known for its ability to tolerate high salt concentrations, so it is not the correct answer in this context.

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  • 42. 

    Topical treatment for S. aureus

    • Penicillin

    • Methicillin

    • Vancomycin

    • Bacitracin

    Correct Answer
    A. Bacitracin
    Explanation
    Bacitracin is a topical treatment for S. aureus because it is effective against gram-positive bacteria, including S. aureus. It works by inhibiting the cell wall synthesis of bacteria, leading to their death. Bacitracin is commonly used in ointments and creams to treat skin infections caused by S. aureus. It is not effective against methicillin-resistant S. aureus (MRSA), but it can still be used to treat other strains of S. aureus.

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  • 43. 

    This exists. 

    • ASO (antibodies to SLO)

    • ASL (antibodies to SLS)

    • ASO and ASL

    Correct Answer
    A. ASO (antibodies to SLO)
    Explanation
    The correct answer is ASO (antibodies to SLO). This suggests that the existence referred to in the question is related to the presence of antibodies to SLO. The options ASL (antibodies to SLS) and ASO and ASL are not chosen as the answer, indicating that the existence mentioned is specifically associated with antibodies to SLO.

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  • 44. 

    Is Staph saprophyticus DNase positive or negative?

    • Positive

    • Negative

    Correct Answer
    A. Negative
    Explanation
    Staphylococcus saprophyticus is a species of bacteria that is commonly found in the urinary tract and is a common cause of urinary tract infections (UTIs) in young women. DNase is an enzyme that breaks down DNA. The question is asking whether Staph saprophyticus is DNase positive or negative. The correct answer is "Negative" because Staph saprophyticus is typically DNase negative, meaning it does not produce the DNase enzyme. This is an important characteristic used in identifying and differentiating Staph saprophyticus from other Staphylococcus species.

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  • 45. 

    Streptococcus pyogenes falls into which group

    • Group A

    • Group B

    • Group D

    • Peptostreptococcus

    Correct Answer
    A. Group A
    Explanation
    Streptococcus pyogenes falls into Group A. This classification is based on the Lancefield grouping system, which categorizes streptococci based on the antigens present on their cell walls. Group A streptococci, including Streptococcus pyogenes, have specific carbohydrates on their cell walls that are recognized by antibodies in the Group A Lancefield antigen test. This test is commonly used to identify and differentiate Group A streptococci from other groups.

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  • 46. 

    M. luteus is what type of species

    • Kytococcus

    • Micrococcus

    • Staphylococcus

    • Planococcus

    Correct Answer
    A. Micrococcus
    Explanation
    M. luteus is classified as a species of Micrococcus.

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  • 47. 

    Corynebacteria species are also known as

    • Planococci

    • S.mucilaginous

    • Diptheroids

    • S. epidermidis

    Correct Answer
    A. Diptheroids
    Explanation
    Corynebacteria species are commonly referred to as diphtheroids. Diphtheroids are a group of bacteria that resemble the bacterium responsible for causing diphtheria, but they do not produce the toxin associated with the disease. These bacteria are commonly found on the skin, mucous membranes, and in other areas of the body. They are considered part of the normal flora and typically do not cause disease unless there is an underlying condition or weakened immune system.

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  • 48. 

    More drug resistant

    • Community-associated MRSA

    • Nosocomially acquired MRSA

    Correct Answer
    A. Nosocomially acquired MRSA
    Explanation
    Nosocomially acquired MRSA refers to Methicillin-resistant Staphylococcus aureus (MRSA) infections that are acquired in healthcare settings such as hospitals or nursing homes. This type of MRSA is typically more drug-resistant compared to community-associated MRSA, which is acquired outside of healthcare settings. The correct answer suggests that nosocomially acquired MRSA is the more drug-resistant form of the infection.

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  • 49. 

    Erythrogenic toxin of Strep pyogenes is a superantigen

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The erythrogenic toxin produced by Streptococcus pyogenes is classified as a superantigen. Superantigens are substances that can activate a large number of T cells, leading to an excessive immune response. In the case of the erythrogenic toxin, it specifically activates T cells that express certain V beta chains, resulting in the characteristic rash seen in scarlet fever. Therefore, the statement that the erythrogenic toxin of Strep pyogenes is a superantigen is true.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
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  • Jun 20, 2010
    Quiz Created by
    Nycpm2013

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