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Related Experiment Videos

Persistent and dormant tubercle bacilli and latent tuberculosis.

Ying Zhang1

  • 1Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland 21205, USA. yzhang@jhsph.edu

Frontiers in Bioscience : a Journal and Virtual Library
|February 24, 2004
PubMed
Summary

Tuberculosis (TB) chemotherapy struggles against dormant bacteria, necessitating new strategies. Research explores mycobacterial persistence, dormancy, and host factors for improved TB control.

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Area of Science:

  • Microbiology
  • Immunology
  • Pharmacology

Background:

  • Mycobacterium tuberculosis exhibits remarkable persistence, causing latent infections in a third of the global population.
  • Current tuberculosis (TB) chemotherapy is effective against growing bacilli but not dormant or persistent forms, leading to prolonged treatment.
  • Confusion exists regarding the terminology of dormant versus persistent bacilli, with various models of mycobacterial persistence established.

Purpose of the Study:

  • To review mechanisms of persistence and dormancy in mycobacteria.
  • To highlight challenges posed by phenotypic drug resistance in persistent/dormant bacilli.
  • To explore the role of host immunity, psychoneuroendocrinology, and novel therapeutic strategies for latent TB.

Main Methods:

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  • Review of existing literature on mycobacterial persistence and dormancy.
  • Analysis of factors contributing to latent TB infection and reactivation.
  • Discussion of current and emerging therapeutic approaches, including immunotherapies.

    • Main Results:

    • Identification of various mycobacterial factors potentially involved in persistence, dormancy, and resuscitation.
    • Observation of latent TB reactivation by anti-TNF-alpha therapies.
    • Recognition of the significant challenge posed by drug-resistant persistent and dormant bacilli.

    Conclusions:

    • Effective TB control requires a multifaceted approach addressing bacterial persistence, host immunity, and environmental factors.
    • Novel drugs targeting dormant bacilli and immunotherapeutic agents are crucial for enhancing chemotherapy.
    • Integrating socioeconomic, nutritional, and psychological support alongside medical treatment is vital for comprehensive TB management.