Tuberculosis

Tuberculosis
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Name	Tuberculosis
Field	Infectious disease, Pulmonology
Symptoms	Cough, fever, night sweats, weight loss
Complications	Pleural effusion, meningitis, miliary disease
Onset	Weeks to months
Causes	Mycobacterium tuberculosis complex
Risks	Immunosuppression, malnutrition, HIV/AIDS, diabetes
Diagnosis	Chest radiography, sputum smear, culture, nucleic acid amplification
Prevention	Bacillus Calmette–Guérin vaccination, infection control, latent treatment
Treatment	Multi-drug antibiotic regimens, directly observed therapy
Frequency	Global; millions affected annually

Tuberculosis is a chronic infectious disease primarily affecting the lungs that has major clinical, public health, and historical significance. It is caused by organisms of the Mycobacterium tuberculosis complex and presents across clinical, social, and global health contexts with varied manifestations and outcomes. Major international organizations, historical figures, and modern health systems have shaped its control and ongoing research priorities.

Overview

Mycobacterial infection produces a spectrum from latent infection to active disease, influenced by host immunity and social determinants; major stakeholders include the World Health Organization, Centers for Disease Control and Prevention, Médecins Sans Frontières, Bill & Melinda Gates Foundation, and national ministries of health. Control strategies intersect with programs run by United Nations, Global Fund, GAVI, International Red Cross and Red Crescent Movement, and academic centers such as Johns Hopkins University, Imperial College London, Harvard University, University of Oxford. Research and policy draw on work by investigators associated with institutions like Pasteur Institute, Rockefeller Foundation, Karolinska Institutet, Max Planck Society, Wellcome Trust.

Signs and symptoms

Pulmonary presentations typically include chronic cough, haemoptysis, fever, night sweats, and weight loss, prompting evaluation at clinics linked to Mayo Clinic, Cleveland Clinic, Massachusetts General Hospital, Royal Free Hospital, Guy's and St Thomas' NHS Foundation Trust. Extrapulmonary manifestations involve lymphatic, musculoskeletal, genitourinary, and central nervous system sites and are seen in referrals to specialist centers such as Great Ormond Street Hospital, St Thomas' Hospital, Mount Sinai Hospital, Royal Brompton Hospital, Karolinska University Hospital.

Cause and pathogenesis

The etiologic agents belong to the Mycobacterium tuberculosis complex with species characterized at laboratories including Centers for Disease Control and Prevention, Institut Pasteur, National Institutes of Health, Wellcome Sanger Institute, ECDC. Infection follows inhalation of aerosolized bacilli emitted from infectious individuals at settings historically exemplified by outbreaks in ships like HMS Bounty (notable for close quarters) and institutions studied by investigators affiliated with University of Cambridge, London School of Hygiene & Tropical Medicine, Columbia University. Host immune response involves macrophage recruitment and granuloma formation studied by teams at Fred Hutchinson Cancer Center, Scripps Research, Broad Institute, Dana-Farber Cancer Institute, Rockefeller University.

Diagnosis

Diagnostic pathways use clinical assessment supported by chest radiography and microbiological methods developed and validated at centers such as Royal Infirmary of Edinburgh, Karolinska Institutet, University College London Hospitals, Johns Hopkins Hospital. Laboratory confirmation employs sputum smear microscopy, mycobacterial culture in laboratories accredited by Clinical and Laboratory Standards Institute, molecular assays such as Xpert MTB/RIF pioneered with partners including Foundation for Innovative New Diagnostics, Cepheid, FIND, and whole-genome sequencing capabilities at Wellcome Sanger Institute, Broad Institute, European Nucleotide Archive-associated facilities.

Prevention and control

Prevention strategies include vaccination with Bacillus Calmette–Guérin (BCG), community screening programs run by World Health Organization, UNICEF, Save the Children, and targeted interventions integrated into services of National Health Service (England), Centers for Disease Control and Prevention, Indian Council of Medical Research. Infection control uses airborne precautions implemented in hospitals like Charité – Universitätsmedizin Berlin, Singapore General Hospital, Royal Melbourne Hospital and occupational programs in settings overseen by International Labour Organization, World Bank, Asian Development Bank. Public health campaigns have involved partners such as PATH, Stop TB Partnership, Bill & Melinda Gates Foundation.

Treatment

Standard treatment employs multi-drug regimens (including isoniazid, rifampicin, pyrazinamide, ethambutol) delivered through programs exemplified by Directly Observed Therapy initiatives promoted by World Health Organization, Stop TB Partnership, and national programs in India, South Africa, Brazil, China, supported by training from London School of Hygiene & Tropical Medicine, Johns Hopkins Bloomberg School of Public Health. Management of drug-resistant cases uses second-line agents and newer drugs evaluated in trials led by consortia at University of Cape Town, University of Witwatersrand, UCSF, Imperial College London, University of Toronto.

Epidemiology and history

Historically, outbreaks and mortality influenced urbanization and public policy in cities such as London, Paris, New York City, Vienna, with seminal contributions from physicians and scientists associated with Robert Koch, Louis Pasteur, Edward Jenner (context of vaccination history), Florence Nightingale, Rudolf Virchow, and institutions like Charité – Universitätsmedizin Berlin, Institut Pasteur, Royal Society. Major 20th- and 21st-century initiatives include commitments by World Health Organization, United Nations General Assembly, Global Fund, and national campaigns in India, China, South Africa, United States. Epidemiologic transitions, the impact of HIV/AIDS epidemics, and programmatic shifts are documented in reports by World Bank, OECD, Bill & Melinda Gates Foundation, UNAIDS. Contemporary surveillance and elimination efforts involve collaborations among WHO End TB Strategy, Stop TB Partnership, Global Fund to Fight AIDS, Tuberculosis and Malaria, and research networks at Wellcome Trust, National Institutes of Health, European Commission.

Category:Infectious diseases