What are the two biggest causes of HAP?

What are the two biggest causes of HAP?

• A. Aerobic Gram-negative bacilli and MRSA
• B. Streptococcus pneumoniae and Haemophilus influenzae
• C. Anaerobes and viruses
• D. Fungi and parasites

Answer: (A)

Hospital-acquired pneumonia is most often driven by bacteria that are common in the healthcare setting and frequently resistant to many drugs. The two biggest culprits are aerobic Gram-negative bacilli (such as Pseudomonas and Enterobacterales) and Staphylococcus aureus that are methicillin-resistant. These organisms are well-adapted to the hospital environment and become leading causes once pneumonia develops after 48 hours of admission. Streptococcus pneumoniae and Haemophilus influenzae are classic causes of community-acquired pneumonia, not the predominant pathogens in the hospital setting. Anaerobes and viruses can cause pneumonia but are not the two most frequent pathogens in HAP. Fungi and parasites are uncommon causes of HAP except in severely immunocompromised patients.

Hospital-acquired pneumonia is most often driven by bacteria that are common in the healthcare setting and frequently resistant to many drugs. The two biggest culprits are aerobic Gram-negative bacilli (such as Pseudomonas and Enterobacterales) and Staphylococcus aureus that are methicillin-resistant. These organisms are well-adapted to the hospital environment and become leading causes once pneumonia develops after 48 hours of admission.

Streptococcus pneumoniae and Haemophilus influenzae are classic causes of community-acquired pneumonia, not the predominant pathogens in the hospital setting. Anaerobes and viruses can cause pneumonia but are not the two most frequent pathogens in HAP. Fungi and parasites are uncommon causes of HAP except in severely immunocompromised patients.