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Ch. 17 - Skin and Eye Infections
Norman-McKay- Microbiology: Basic and Clinical Principles 2nd Edition
Norman-McKay2nd EditionMicrobiology: Basic and Clinical PrinciplesISBN: 9780137661619당신이 사용하는 게 아니라요?교과서 변경
13장, 문제 7

Which of the following is not a virulence factor of P. aeruginosa?
a. Protein A
b, Exotoxins
c. Enzymes that damage host tissues
d. Endotoxins
e. Factors that enhance biofilm formation

검증된 단계별 안내
1
Step 1: Understand what a virulence factor is. Virulence factors are molecules produced by pathogens like bacteria that enable them to colonize the host, evade or inhibit the immune response, and cause damage to the host tissues.
Step 2: Review the known virulence factors of Pseudomonas aeruginosa. This bacterium is known for producing exotoxins (such as Exotoxin A), enzymes that damage host tissues (like elastase and proteases), endotoxins (as it is a Gram-negative bacterium with lipopolysaccharide in its outer membrane), and factors that enhance biofilm formation, which help it persist in hostile environments.
Step 3: Analyze each option: Protein A is a virulence factor commonly associated with Staphylococcus aureus, not Pseudomonas aeruginosa.
Step 4: Confirm that exotoxins, enzymes damaging host tissues, endotoxins, and biofilm formation factors are all established virulence factors of P. aeruginosa.
Step 5: Conclude that the option which is not a virulence factor of P. aeruginosa is Protein A.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
2m

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Virulence Factors

Virulence factors are molecules produced by pathogens that enable them to infect the host, evade the immune system, and cause disease. These include toxins, enzymes, and structures that facilitate colonization and damage to host tissues.
추천 영상:
03:05
Virulence

Pseudomonas aeruginosa Virulence Mechanisms

P. aeruginosa is a Gram-negative bacterium known for producing exotoxins, enzymes that degrade host tissues, and biofilm-forming factors. These virulence traits help it establish infections, resist immune responses, and survive in hostile environments.
추천 영상:
03:05
Virulence

Endotoxins vs. Exotoxins

Endotoxins are components of the outer membrane of Gram-negative bacteria, released upon cell death, while exotoxins are actively secreted proteins that directly damage host cells. P. aeruginosa primarily produces exotoxins, not endotoxins, as virulence factors.
추천 영상:
07:22
Exotoxins vs. Endotoxin Review
관련 실천
교과서 질문

Select ALL the true statements about dermatophytes:

a. They are a group of bacteria that cause cutaneous infections.

b. They may be treated with antifungals without knowing the exact causative agent.

c. They are easily treated with antibiotics.

d. They are commonly acquired from the soil, environment, or animals.

e. They produce enzymes that digest keratin found in hair, nails, and skin.

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교과서 질문

All of the following are commonly associated with Streptococcus pyogenes EXCEPT:

a. impetigo.

b. cellulitis.

c. scalded skin syndrome.

d. necrotizing fasciitis.

e. strep throat.

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교과서 질문

Which genus is primarily associated with acne?

a. Staphylococcus

b. Propionibacterium

c. Clostridium

d. Streptococcus

e. Pseudomonas

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교과서 질문

Conjunctivitis is caused by the following agent types (select ALL that apply):

a. bacteria.

b. viruses.

c. protozoa.

d. fungi.

e. helminths.

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교과서 질문

Select the false statement about cutaneous candidiasis:

a. The most common causative species is Candida albicans.

b. Candida albicans can be part of normal microbiota.

c. Usage of antibiotics can increase the chance of cutaneous candidiasis.

d. Changes in pH can permit overgrowth.

e. The causative agents are naturally found as mold filaments.

1139
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교과서 질문

Choose the false statement about HSV-1:

a. Viruses may be transmitted via wrestling mats.

b. Viruses may be transmitted via contact with lesions.

c. Viruses may be transmitted via the saliva of others with the virus.

d. Viruses may reactivate under stress-inducing conditions.

e. Viruses can be easily cured with common antivirals.

1113
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