Contamination of sputum induction equipment during patient usage

Area of Science:

• Microbiology
• Infectious Diseases
• Public Health

Background:

• Mycobacterium tuberculosis (MTB) causes tuberculosis (TB), a significant global health concern.
• Sputum induction is a common method for obtaining respiratory specimens for TB diagnosis.
• The potential for cross-contamination of sputum induction equipment by MTB requires investigation.

Purpose of the Study:

• To assess the contamination risk of sputum induction equipment by patients with active pulmonary tuberculosis.
• To identify specific components of the induction apparatus susceptible to MTB contamination.
• To evaluate the efficacy of decontamination methods for preventing MTB transmission via equipment.

Main Methods:

• Sputum induction equipment components, including mouthpiece, goose-neck tubing, and 10% NaCl solution, were exposed to patients with confirmed Mycobacterium tuberculosis.
• Post-exposure samples from equipment components and solutions were cultured for MTB.
• The effectiveness of 2% glutaraldehyde for decontamination was tested on contaminated components.

Main Results:

• The mouthpiece, goose-neck tubing, and 10% NaCl solution demonstrated susceptibility to contamination by Mycobacterium tuberculosis.
• Two percent glutaraldehyde effectively decontaminated the tested components of the sputum induction apparatus.
• Contamination was observed on multiple parts of the induction system, highlighting the need for comprehensive cleaning.

Conclusions:

• Sputum induction equipment, particularly the mouthpiece, goose-neck, and saline, can become contaminated with Mycobacterium tuberculosis.
• Rigorous cleaning and decontamination of the entire sputum induction apparatus are essential between patient uses to prevent TB transmission.
• The use of 2% glutaraldehyde is recommended as an effective decontamination agent for this equipment.