What is Tuberculosis?

Definition and general information of tuberculosis

Tuberculosis (TB) is an infectious disease caused by the Mycobacterium tuberculosis complex that mainly affects the lungs but can also affect other organs. It is one of the most common and deadly infectious diseases in the world, despite effective methods of diagnosis and treatment. Tuberculosis is airborne, and infection occurs by inhaling Mycobacterium tuberculosis bacteria, which are released when an infected person coughs or sneezes. According to the World Health Organization (WHO), approximately 10 million new cases of tuberculosis were reported worldwide in 2020. The disease is particularly common in low- and middle-income countries and is often associated with other health problems such as HIV/AIDS.

History and prevalence of tuberculosis

Causes and transmission of tuberculosis

Mycobacterium tuberculosis bacterium

Modes of transmission

Symptoms of tuberculosis

Early symptoms

Early symptoms of tuberculosis are often non-specific and mild, so the disease can remain unrecognized for a long time. Initial symptoms may include:

• Mild cough
• Fatigue
• A slight fever
• Night sweats
• Weight loss

These symptoms can be so mild that patients often ignore them as signs of a cold or flu. Due to the slow development of tuberculosis, these symptoms may persist for several weeks or even months before medical attention is sought. Early diagnosis is important to prevent the disease from progressing and spreading to others, so it is essential that individuals with these symptoms, especially those at high risk, seek medical attention.

Progressive symptoms

As the disease progresses, the symptoms become more pronounced and varied:

• Persistent cough that may be productive with sputum and, in some cases, blood-tinged sputum
• Shortness of breath
• Chest pain that worsens with coughing or deep breathing
• Significant weight loss
• Prolonged fever
• Night sweats
• General malaise

If tuberculosis is not diagnosed and treated early, the bacteria can spread outside the lungs, causing extrapulmonary tuberculosis, which can affect the lymph nodes, pleura, bones, kidneys, and even the central nervous system.

Tuberculosis diagnostics

Diagnostic methods

Diagnosis of tuberculosis includes several methods, including clinical examination, laboratory tests and imaging procedures. The initial examination includes taking the patient's history and physical examination. The leading laboratory method in the diagnosis of tuberculosis is sputum microscopy, which includes the microscopic examination of Mycobacterium tuberculosis by the Ziehl-Neelsen staining method. However, such a method may not be sensitive enough, so a sputum culture is additionally used, which is the gold standard to confirm the diagnosis. Molecular diagnostic methods are also often used, such as the PCR test, which provides fast and accurate detection of the pathogen, as well as allows identification of drug resistance. Imaging techniques, such as chest x-rays, help assess lung damage.

Differential diagnosis

Differential diagnosis is an essential part of the diagnosis of tuberculosis, because its symptoms can resemble other diseases. Pulmonary tuberculosis must be differentiated from:

• Chronic bronchitis
• Lung cancer
• Lung abscess
• Sarcoidosis
• Pneumonia caused by other infections

In the differential diagnosis, it is important to take into account the patient's clinical history, contact anamnesis, radiological data and laboratory test results. Since other diseases, such as fungal infections or bacterial pneumonias, can have similar symptoms, an accurate and thorough investigation is necessary. The interpretation of the results should be done by experienced specialists in order to avoid wrong diagnosis and choosing a treatment strategy.

Treatment of tuberculosis

Treatment challenges and resistance

Side effects and monitoring

During treatment, patients may experience several side effects that must be taken into account to ensure safe and effective therapy. Possible side effects include:

• Liver damage
• Allergic reactions
• Gastrointestinal disorders
• Changes in vision (associated with ethambutol)

To ensure the successful course of the patient's treatment, regular medical supervision is essential, which includes the control of laboratory parameters and observation of the patient's clinical condition. Patients are encouraged to report any side effects so that necessary adjustments in therapy can be made.

Prevention and health measures

Vaccination and immunity

Preventive measures in the fight against tuberculosis include vaccination and strengthening immunity. The BCG (Bacillus Calmette-Guérin) vaccine is the world's most widely used vaccine against tuberculosis. It is given to newborns in many countries, especially where tuberculosis is endemic. Although the BCG vaccine does not protect against all forms of the disease, it is effective against severe forms of tuberculosis in children, such as miliary tuberculosis and tuberculous meningitis. Further research is being done to develop new and more effective vaccines that can also protect adults and provide longer-lasting immunity. Boosting immunity also includes improving general health, nutritional supplementation, and fighting HIV and other immune-debilitating infections.

Public health strategies

Public health strategies to combat tuberculosis include education and awareness campaigns, early diagnosis and treatment, and contact tracing. Education campaigns help inform the public about tuberculosis symptoms, modes of transmission and prevention measures, thereby promoting early detection and treatment of the disease. Contact tracing is important to identify and treat those who have been in contact with infected individuals, thus preventing the spread of the disease. In addition, by improving living conditions, ventilation and nutritional quality, it is possible to reduce the risk of infection. Programs are also being implemented to strengthen health care systems and ensure access to diagnosis and treatment.

Infection control measures

Infection control measures are essential to prevent the spread of tuberculosis, especially in health care settings. These measures include:

• Improvement of ventilation
• Safe cough etiquette
• Staff training on infection control procedures
• Use of personal protective equipment

These measures are essential to ensure the safety of patients and healthcare workers, as well as to reduce the risk of contracting tuberculosis.

Conclusions and future perspectives

Key points

Tuberculosis is a serious infectious disease that continues to be a major public health problem worldwide, particularly in low-income countries. Although effective diagnostic and treatment methods are available, the prevalence of the disease remains high, fueled by drug resistance and inadequate access to healthcare. Early recognition of symptoms and timely treatment are essential to prevent disease progression and spread. Vaccination, public education and strengthening health care systems are the main tools for prevention. International cooperation and innovation are also needed to effectively combat this chronic disease.

Research directions and innovations

Future research directions in the fight against tuberculosis include:

• Development of new diagnostic tests
• Development of more effective vaccines
• Development of new therapeutic methods

Global and regional initiatives

At the same time, local measures adapted to the needs and epidemiological situation of specific regions are also implemented. Such initiatives include community engagement and awareness raising to reduce stigma and improve patient access to health care services, and to ensure that health workers are trained and equipped to effectively diagnose and treat tuberculosis.

Impact on society and the health care system

Measures to combat tuberculosis have a significant impact not only on public health, but also on the health care system as a whole. Effective control and treatment of tuberculosis can reduce the burden of disease, improve patients' quality of life, and reduce mortality. This in turn strengthens the health care system by reducing hospitalization and treatment costs and freeing up resources for other health problems.

In addition, a successful tuberculosis control strategy can serve as a model for combating other infectious diseases, encouraging the development and implementation of innovative approaches in health care policy and practice. This highlights the need for an integrated and multidisciplinary approach that includes not only medical but also social and economic factors to achieve sustainable improvements in public health.