Complete bacteriological examination of water includes all, EXCEPT:

Appeared in: PGICH Noida NO-2025

Explanation

the option that is NOT a standard part of the bacteriological examination of water.
Standard tests look for Faecal Streptococci (Enterococci) as an indicator of faecal pollution, not Faecal Staphylococci.
Staphylococci are typically associated with skin and mucous membranes and are not considered reliable indicators of faecal contamination in water.

Option A: Colony Count is a fundamental part of water testing. It provides an estimate of the general bacterial purity and helps detect sudden contamination.
Option B: Testing for Clostridium perfringens is a standard supplementary test. Its spores are very resistant and indicate past or intermittent faecal contamination.
Option D: The Presumptive Coliform Test is the primary and most crucial test for detecting coliform bacteria (like E. coli), which are the main indicators of recent faecal pollution.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Bacteriological Examination of Water as background academic context rather than a clinical decision trigger.
Ensuring the bacteriological safety of drinking water is a cornerstone of public health nursing to prevent waterborne diseases like cholera, typhoid, dysentery, and hepatitis A.
Nurses in community settings play a vital role in health education regarding safe water practices, such as boiling water, using filters, and recognizing signs of contamination.
A community health nurse must understand the implications of a contaminated water report to take immediate action, such as notifying the public, advising on alternative water sources, and monitoring for outbreaks of gastrointestinal illness.

How to Approach the Question

First, identify the negative keyword 'EXCEPT' in the question stem. This signals that you must find the option that does NOT belong.
The question asks which test is NOT part of a complete bacteriological examination of water. This means three of the options are standard tests, and one is not.
Recall the standard indicator organisms for water purity: coliforms (E. coli), faecal streptococci, and Clostridium perfringens. Also, recall the general test for bacterial load (colony count).
Evaluate each option against this knowledge.
Option A, Colony Count, is a standard general test.
Option B, Test for Clostridium perfringens, is a standard test for remote contamination.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart B (pp 233-449 of 464) pp. 43-45, 38-40

Practise the full PGICH Noida NO-2025

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