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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: 9780137661619Non è quello che usi tu?Cambia libro di testo
Capitolo 13, Problema 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

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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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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.
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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.
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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.
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Exotoxins vs. Endotoxin Review
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