What is the fungus that yields penicillin?

Appeared in: MNS 2015

Explanation

Penicillin is a cornerstone antibiotic used to treat numerous bacterial infections.
It is a natural product derived from a specific genus of fungus (mold) called Penicillium.
The discovery was made by Alexander Fleming from the species Penicillium notatum (or P. rubens).
For large-scale industrial production, the species Penicillium chrysogenum is preferred due to its higher antibiotic yield.

Option A: The term 'Alpine' refers to a high-altitude geographical region or its associated flora, not a microorganism.
Option B: Although yeast is a type of fungus, the species commonly associated with the term (like Saccharomyces) do not produce penicillin. They are used in fermentation for baking and brewing.
Option D: Cinchona is a genus of trees, not a fungus. Its bark is the source of quinine.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Source of the antibiotic penicillin as background academic context rather than a clinical decision trigger.
Understanding the origins of common medications like penicillin is fundamental in nursing pharmacology. It helps in classifying drugs and understanding their mechanisms.
Knowledge of drug sources is crucial for identifying potential allergies. A penicillin allergy is one of the most commonly reported drug allergies.
What if a patient reports a penicillin allergy? The nurse's primary responsibility is to ensure this is clearly documented and communicated to the entire healthcare team. The nurse must withhold any penicillin-class antibiotics and anticipate the prescription of an alternative, such as a macrolide (e.g., azithromycin) or, with caution, a cephalosporin, depending on the nature of the allergic reaction.

How to Approach the Question

This is a factual recall question based on microbiology and pharmacology.
First, identify the keywords in the question: 'fungus' and 'penicillin'.
Analyze the options to see which one is a fungus known for producing penicillin.
Option A, 'Alpine', is a geographical term. Eliminate it.
Option B, 'Yeast', is a fungus, but it's primarily associated with fermentation (baking, brewing), not penicillin.
Option C, 'Penicillium', shares its root name with 'penicillin', making it a very strong candidate.

Concept Tested & Keywords

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E6 Microbiology Essentials Sastry 4e Part 1 p. 123-125

E6 Microbiology Applied AnjuDhir 3e Part 2 p. 77-79

Practise the full MNS 2015

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