Which of the following are ways that pathogens can evade the immune system? (Select all that apply)
viral latency
host defense failure
immunosuppression
Immunodeficiency
Correct Answer : A,B,C,D
A. Viral Latency: Some viruses, like herpesviruses, can enter a latent phase where they hide in host cells, making it challenging for the immune system to detect and target them.
B. Host Defense Failure: This term encompasses situations where the host's defense mechanisms, including physical barriers and immune responses, are not effective in preventing or controlling infection. For example, pathogens may develop mechanisms to evade detection by the immune system.
C. Immunosuppression: Pathogens can actively suppress the host's immune response. They may produce molecules or proteins that inhibit the immune system's ability to mount an effective defense.
D. Immunodeficiency: Individuals with immunodeficiency disorders have weakened immune systems, which can be congenital (genetic) or acquired. This weakness makes them more susceptible to infections.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Obtaining all cultures before the antibiotic is administered: While obtaining cultures is important for identifying the specific pathogen causing the infection and guiding targeted antibiotic therapy, waiting for culture results can take time. During this time, the infection can progress. Therefore, it's generally recommended to initiate broad-spectrum antibiotics first and then adjust the treatment based on culture results.
B. Delaying administration of the antibiotic until the culture results are available: Delaying antibiotics until culture results are available can be risky, as it allows the infection to progress, potentially leading to sepsis or other severe complications.
C. Administering antipyretics as soon as possible: Administering antipyretics like acetaminophen or ibuprofen can help reduce fever and make the patient more comfortable. However, the primary intervention for a suspected infection is antibiotic therapy, as it targets the underlying cause of the fever.
D. Administering the antibiotic immediately: When dealing with a patient with a fever of unknown origin and a suspected infection, the priority is to start appropriate antibiotic therapy promptly. Delaying antibiotic administration can allow the infection to worsen, leading to serious complications.
Correct Answer is C
Explanation
A. Gentamicin: Gentamicin is an aminoglycoside antibiotic effective against many bacteria, but it's not the first choice for MRSA. Vancomycin or other alternatives are preferred due to the rising resistance of MRSA to gentamicin.
B. Nafcillin: Nafcillin is a penicillin antibiotic, often used for penicillin-sensitive staphylococcal infections. However, it is not effective against MRSA, which is resistant to many penicillin-based antibiotics.
C. Vancomycin: Vancomycin is a glycopeptide antibiotic used to treat a variety of bacterial infections, including MRSA. It works by inhibiting cell wall synthesis in bacteria, making it effective against Gram-positive bacteria that have developed resistance to other antibiotics like methicillin (which MRSA has).
D. Penicillin: Penicillin is a group of antibiotics that includes drugs like amoxicillin and ampicillin. MRSA is resistant to penicillin-based antibiotics, so they are not effective against MRSA infections.
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