What is tuberculosis

Understanding Tuberculosis

Tuberculosis (TB) is one of the world's most significant infectious diseases, caused by the bacterium Mycobacterium tuberculosis. This disease has affected humanity for centuries and remains a major public health concern despite modern medical advances. Understanding TB transmission, symptoms, and treatment is crucial for prevention and early intervention.

How TB Spreads

Tuberculosis spreads from person to person through airborne droplets. When an infected person coughs, sneezes, or speaks, they release droplets containing the bacteria into the air. Others nearby can inhale these droplets and become infected. TB is not spread through contaminated food or water, touching, or sharing personal items. The infection requires close and prolonged contact, typically indoors, for transmission to occur. This is why TB often spreads in crowded living conditions and among people with frequent close contact.

Types and Symptoms

TB manifests in two primary forms: latent TB infection and active TB disease. Latent TB means the bacteria are present but inactive, and the person is not contagious. Active TB develops when dormant bacteria become active, causing disease symptoms. Common symptoms of active TB include a persistent cough lasting more than three weeks, chest pain when breathing or coughing, coughing up blood, fever, night sweats, and weight loss. Symptoms can develop weeks to months after infection, and early diagnosis is important for effective treatment.

Diagnosis and Treatment

TB is diagnosed through skin tests, chest X-rays, and sputum samples. Treatment involves a combination of antibiotics typically taken for six months. Completing the full course of treatment is essential to prevent drug-resistant TB and ensure cure. Most people with TB can be cured if treated properly. Latent TB infection can be treated with preventive therapy to prevent progression to active disease, protecting both the individual and the community.

Prevention and Global Impact

TB prevention includes vaccination with the BCG vaccine in many countries, testing high-risk populations, and treating latent infections. Global TB rates have declined but remain concerning, particularly in developing nations with limited healthcare access. TB disproportionately affects people with weakened immune systems, malnutrition, and those living in crowded conditions. Public health efforts continue to work toward TB elimination worldwide.