Silicotuberculosis: Current Evidence, Clinical Challenges, and Management Strategies

Abstract

Silicotuberculosis is a severe clinical condition characterized by the coexistence of silicosis resulting from exposure to respirable crystalline silica (RCS) and infection with Mycobacterium tuberculosis. Ongoing exposure of millions of workers worldwide to silica dust across multiple industries has made silicotuberculosis an increasing global public health concern. Silica exposure disrupts alveolar macrophage function, promotes oxidative stress, inflammation, and fibrosis, and facilitates both primary tuberculosis infection and reactivation of latent disease. Current evidence indicates that individuals with silicosis have a markedly increased lifetime risk of developing both pulmonary and extrapulmonary tuberculosis. The diagnosis of silicotuberculosis remains challenging because clinical and radiological features of silicosis and tuberculosis often overlap. Chest radiography and computed tomography are frequently insufficient for differentiation, while molecular rapid diagnostic tests improve detection but may show reduced sensitivity in the presence of comorbidities such as HIV infection. Treatment outcomes in patients with silicosis and tuberculosis are generally poorer than in tuberculosis alone, with higher rates of treatment failure, relapse, and mortality, highlighting the need for optimized therapeutic strategies. Primary prevention relies on reducing occupational exposure to respirable crystalline silica through engineering controls, effective ventilation, personal protective equipment, and workplace surveillance. Secondary prevention focuses on early detection and management of latent tuberculosis infection in high-risk populations. Given the persistent and elevated tuberculosis risk associated with silicosis, regular screening and integrated occupational health policies are essential. In conclusion, silicotuberculosis is a complex occupational lung disease with significant diagnostic and therapeutic challenges. Multidisciplinary approaches that integrate tuberculosis control programs with occupational health interventions are critical to reducing disease burden, particularly in high-risk worker populations.

Keywords

• Silicotuberculosis
• silicosis
• tuberculosis
• occupational lung diseases
• respirable crystalline silica
• latent tuberculosis infection

Silikotüberkülozda Güncel Kanıtlar, Klinik Zorluklar ve Yönetim Stratejileri

Öz

Silikotüberküloz (Siliko-TB), solunabilir kristal silika (SKS) maruziyeti sonucu gelişen silikozis ile Mycobacterium tuberculosis enfeksiyonunun bir arada bulunduğu, ağır seyirli bir klinik tablodur. Dünya genelinde milyonlarca çalışanın çeşitli endüstrilerde SKS tozuna maruz kalması, Siliko-TB’yi giderek büyüyen bir halk sağlığı sorunu haline getirmektedir. Silika, alveoler makrofaj fonksiyonunu bozarak oksidatif stres, inflamasyon ve fibrozise yol açmakta; bu süreç tüberküloz basillerinin kolayca yerleşmesine ve latent enfeksiyonun reaktivasyonuna zemin hazırlamaktadır. Güncel veriler, silikozisli bireylerde pulmoner ve ekstrapulmoner TB gelişme riskinin belirgin şekilde arttığını, hatta yaşam boyu yüksek seyrettiğini göstermektedir. Siliko-TB tanısı, klinik ve radyolojik bulguların silikozis ile TB arasında benzerlikler göstermesi nedeniyle zor olabilmektedir. Akciğer grafisi ve bilgisayarlı tomografi (BT) çoğu zaman ayırt edici değildir; moleküler hızlı testler ve BT bulguları tanıda değerli olmakla birlikte, duyarlılık HIV gibi ek hastalıklarda azalabilmektedir. Silikozisli hastalarda TB tedavi sonuçları genellikle daha kötüdür; tedavi başarısızlığı ve nüks oranları belirgin biçimde yüksektir. Bu nedenle standart rejimlerin etkinliğini artıracak yeni tedavi stratejilerine ihtiyaç vardır. Birincil korunma, SKS maruziyetinin azaltılmasına dayanır. Tozu kaynakta önleme, mühendislik kontrolleri, etkin havalandırma, uygun maske dahil kişisel koruyucu donanımlar ve işyeri denetimleri temel unsurlardır. İkincil korunmada ise latent TB enfeksiyonunun tespiti ve uygun kemoprofilaksi öne çıkmaktadır. Silikozisin TB üzerindeki belirgin etkileri göz önüne alındığında, riskli gruplarda düzenli tarama programlarının uygulanması kritik öneme sahiptir. Sonuç olarak, Siliko-TB, tanısal zorlukları, yüksek mortalite riski ve sınırlı tedavi başarısı nedeniyle kapsamlı, disiplinler arası müdahaleler gerektiren önemli bir mesleki akciğer hastalığıdır. İş sağlığı politikalarının güçlendirilmesi ve riskli topluluklara yönelik hedefe yönelik stratejiler bu yükün azaltılmasında temel rol oynamaktadır.

Anahtar Kelimeler

• Silikotüberküloz
• silikozis
• tüberkülozis
• mesleki akciğer hastalıkları
• solunabilir kristal silika
• latent tüberküloz enfeksiyonu

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