Nosocomial infections occur due to microbes known as:

Appeared in: UP CHO - 10 September 2021

Explanation

Bacteria are the most common microorganisms responsible for causing nosocomial or health care-associated infections (HAIs).
Common bacterial pathogens include Staphylococcus aureus (including MRSA), E. coli, Pseudomonas aeruginosa, and Klebsiella species.
These infections are often difficult to treat because the bacteria may have developed resistance to multiple antibiotics due to previous exposure in the hospital environment.
Major sites for HAIs include the urinary tract (CAUTI), surgical wounds (SSI), bloodstream (CLABSI), and respiratory tract (VAP), all predominantly caused by bacteria.

Option A: While fungi (like Candida) can cause nosocomial infections, they are a less frequent cause compared to bacteria.
Option C: Blue-green algae (cyanobacteria) are environmental organisms and are not recognized as a common cause of infections in humans, especially in a hospital setting.
Option D: Viruses can cause outbreaks in hospitals (e.g., influenza, norovirus), but they account for a smaller proportion of overall HAIs than bacteria.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Causative agents of nosocomial (hospital-acquired) infections as background academic context rather than a clinical decision trigger.
Nurses are at the forefront of HAI prevention through meticulous hand hygiene, use of personal protective equipment (PPE), and adherence to aseptic techniques.
A critical nursing responsibility is the surveillance for signs of infection and prompt reporting, especially in patients with invasive devices like catheters or ventilators.
Patient and family education on hand hygiene and infection precautions is a key nursing intervention to prevent the spread of HAIs.

How to Approach the Question

First, understand the term 'nosocomial infection,' which means an infection acquired in a hospital or healthcare setting.
Next, consider the question's focus: the most common type of 'microbe' causing these infections.
Evaluate each option's role as a pathogen in a hospital environment.
Recall that bacteria are the most frequent cause of common HAIs like catheter-associated urinary tract infections (CAUTIs), surgical site infections (SSIs), and ventilator-associated pneumonia (VAP).
While fungi and viruses can also cause HAIs, they are statistically less common than bacteria.
Eliminate 'blue-green algae' as it is not a typical human pathogen in this context.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor p. 167-169

E6 Pharmacology Nursing Lilley 11e Part 2 p. 292-294

E6 Nursing Fundamentals Potter Perry 12e Part 2 p. 221-223

Practise the full UP CHO - 10 September 2021

Attempt every question from this paper in a timed mock, then review the full solution for each one.