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Related Experiment Videos

Tuberculosis bacteriologic reliability. Sputum specimens submitted by mail.

A K Dutt, F de Miranda, L Brown

    JAMA
    |August 22, 1977
    PubMed
    Summary
    This summary is machine-generated.

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    Examining mailed sputum specimens for tubercle bacilli is reliable. Delaying examination of sputum samples did not reduce diagnostic accuracy, though contamination rates were slightly higher in mailed specimens.

    Area of Science:

    • Microbiology
    • Clinical Diagnostics
    • Public Health

    Background:

    • Early and accurate diagnosis of tuberculosis is crucial for effective treatment and control.
    • Sputum microscopy remains a primary diagnostic tool for detecting Mycobacterium tuberculosis.
    • Logistical challenges in specimen transport can impact diagnostic turnaround times.

    Purpose of the Study:

    • To evaluate the reliability of examining mailed sputum specimens for the presence of tubercle bacilli.
    • To compare the diagnostic yield of fresh sputum examinations versus examinations after a delay (mailed specimens).

    Main Methods:

    • 132 sputum specimens were collected and divided into two portions.
    • One portion was examined immediately ('fresh'); the other was mailed and examined after a 1-8 day delay.

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  • Both portions were analyzed for the presence of tubercle bacilli.

    • Main Results:

    • A few discrepancies were noted between fresh and mailed specimen results.
    • No significant diagnostic advantage was demonstrated for examining fresh sputum portions over mailed portions.
    • The contamination rate was slightly higher in mailed specimens (6.6%) compared to fresh specimens.

    Conclusions:

    • Mailed sputum specimens are a reliable method for diagnosing tuberculosis, with diagnostic accuracy comparable to fresh specimens.
    • The slight increase in contamination rates for mailed specimens did not outweigh the diagnostic utility.
    • This finding supports the feasibility of using mailed sputum for tuberculosis diagnosis, particularly in resource-limited settings.