Related Experiment Video

Updated: Jun 28, 2026

Visualization of Pseudomonas aeruginosa within the Sputum of Cystic Fibrosis Patients
07:25

Visualization of Pseudomonas aeruginosa within the Sputum of Cystic Fibrosis Patients

Published on: July 16, 2020

Phenol ammonium sulphate basic fuchsin staining of sputum in pot for the detection of acid-fast bacilli

N Selvakumar1, Michel Premkumar, Vanaja Kumar

  • 1Tuberculosis Research Centre (ICMR), Chetput, Chennai, India. selvakumar.nagamiah@gmail.com

The Indian Journal of Medical Research
|November 13, 2008
PubMed
Abstract

Insights

A novel pot method for staining sputum samples is comparable to the standard Ziehl-Neelsen (ZN) method for detecting acid-fast bacilli (AFB). This safer technique offers comparable results and potential advantages for tuberculosis diagnosis.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Public Health

Background:

  • Improper sputum smear preparation and disposal pose significant biohazard risks.
  • Current methods for acid-fast bacilli (AFB) detection require careful handling to prevent contamination.

Purpose of the Study:

  • To evaluate a new 'pot method' for staining sputum samples directly in their containers for AFB detection.
  • To compare the diagnostic accuracy and safety of the pot method against the standard Ziehl-Neelsen (ZN) staining technique.

Main Methods:

  • A total of 575 sputum samples from pulmonary tuberculosis patients were analyzed.
  • Samples were stained using both the novel pot method and the standard ZN method.
  • Proportions of AFB-positive smears were statistically compared between the two methods.

Main Results:

  • Both pot and ZN methods identified 126 AFB-positive samples, with no statistically significant difference.
  • The pot method missed 9 ZN-positive smears, while the ZN method missed 9 pot-positive smears; differences were not significant.
  • A significantly higher number of high-grade (3+) positive smears were observed with the pot method (42) compared to the ZN method (25).

Conclusions:

  • The pot method demonstrates comparable performance to the standard ZN method for AFB detection in sputum.
  • The pot method presents several advantages and warrants further investigation for routine use in diagnosing pulmonary tuberculosis.
  • This method offers a potentially safer alternative for AFB smear preparation and analysis.

More Related Videos

The WinCF Model - An Inexpensive and Tractable Microcosm of a Mucus Plugged Bronchiole to Study the Microbiology of Lung Infections06:57

The WinCF Model - An Inexpensive and Tractable Microcosm of a Mucus Plugged Bronchiole to Study the Microbiology of Lung Infections

Published on: May 8, 2017

Related Concept Videos

Sputum Studies I: Gram Stain, cytology, and Acid-fast smear and culture01:26

Sputum Studies I: Gram Stain, cytology, and Acid-fast smear and culture

Sputum studies are a critical part of diagnosing and treating numerous respiratory conditions. These studies involve obtaining sputum samples for analysis to identify pathogenic organisms and assess the presence of abnormal cells indicative of malignant conditions. This lesson will delve into three fundamental sputum studies: Gram Stain, Cytology, and Acid-fast Smear and Culture.
Gram Stain
The Gram Stain is an integral part of sputum studies. It involves the staining of sputum, which permits...
Special Staining Techniques01:13

Special Staining Techniques

Specialized staining techniques play a vital role in microbiology by enabling the visualization of specific bacterial structures that remain undetectable with standard microscopy methods. These techniques not only enhance the structural visualization of bacterial cells but also provide critical insights into their pathogenicity and classification. Additionally, they support diagnostic and research endeavors in microbiology by identifying key bacterial features.Capsule Staining for Virulence...
Differential Staining Technique01:26

Differential Staining Technique

Differential staining is an essential microbiological technique that exploits variations in cell wall structures to classify and identify microorganisms. It facilitates the distinction of bacteria, aiding in diagnostic and research applications. Two of the most widely used differential staining methods are Gram staining and acid-fast staining, both of which rely on the chemical and structural differences in bacterial cell walls.Gram Staining TechniqueGram staining differentiates bacteria by...
Sputum Studies II: Culture and Sensitivity01:20

Sputum Studies II: Culture and Sensitivity

Description
Sputum culture and sensitivity is a medical procedure used to diagnose bacterial infections in the respiratory tract and select the most appropriate antibiotics for treatment. This process involves analyzing sputum samples of thick and opaque secretions produced in the lungs and airways. These samples are collected from patients and then sent to the laboratory for analysis.
The test can identify various pathogens responsible for respiratory infections, including Streptococcus,...
Fixation and Sectioning01:03

Fixation and Sectioning

Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
Simple Staining Technique01:24

Simple Staining Technique

OverviewStaining techniques in microscopy enhance the visualization of microorganisms by increasing contrast and allowing the differentiation of cellular structures. Simple staining is one of the fundamental methods used to observe the basic morphological characteristics of microorganisms, including their size, shape, and arrangement. This method relies on the application of a single dye to stain the entire cell, producing a clear contrast between the cell and the background.FixationFixation is...