Tuberculosis is a bacterial infectious disease caused by Mycobacterium tuberculosis. It most often affects the lungs, but can also involve the central nervous system, lymph nodes, bones, joints, genitourinary system, and even the skin.
How does infection occur? Most often by airborne transmission — by inhaling droplets of secretions from a sick person during coughing, speaking, laughing, or singing. Much less frequently, infection occurs by the digestive route — by consuming unpasteurized milk from sick cattle.
Who is the source of infection? • primarily a patient with pulmonary tuberculosis who is smear-positive, • a risk group can also be cattle infected with bovine tuberculosis, • people sick with extrapulmonary tuberculosis are not contagious.
Incubation period: difficult to determine — the first phase of infection can be asymptomatic for many months or years.
Who is most at risk? • people living in countries with high incidence (Asia, Africa), • people with reduced immunity (HIV, immunosuppressive treatment, cancer), • people having close contact with the sick, • health care workers, • people living in high population density (dormitories, prisons, shelters).
Most common symptoms in pulmonary tuberculosis: • chronic cough lasting more than 3 weeks, • coughing up mucous or purulent secretions (sometimes with blood), • chest pain, • shortness of breath, • fever, chills, night sweats, • weakness, lack of appetite, weight loss.
How does the disease proceed? Tuberculosis has two stages:
Possible complications: • destruction of lung parenchyma, • hemoptysis, respiratory failure, • disseminated tuberculosis (life-threatening condition), • involvement of meninges, lymph nodes, bones (osteoarticular tuberculosis), genitourinary system.
When is urgent medical consultation needed? • cough over 3 weeks, • hemoptysis, shortness of breath, sudden weight loss, • fever lasting over 2 weeks, • contact with a person sick with tuberculosis and appearance of symptoms.
Tuberculosis occurs all over the world, but most often in countries with lower health care standards.
Highest risk of illness: • Sub-Saharan Africa, • South and Southeast Asia, • countries with high population density and difficult sanitary conditions.
WHO estimates that more than 2 billion people are infected with the tuberculosis bacillus. Every year the disease causes over 1.5–2 million deaths worldwide.
For whom is this information particularly important? • people traveling to African and Asian countries, • humanitarian workers, • people planning longer trips or medical volunteering.
• Avoiding contact with people coughing or suspected of illness. • Ventilating rooms, wearing masks in places with high density of people. • Not drinking unpasteurized milk or its products. • In case of travel to high-risk countries — avoiding crowded, poorly ventilated places. • Early detection and treatment of patients — the most important element of stopping transmission.
Type of vaccine: live, attenuated — BCG (Bacillus Calmette-Guérin).
Effectiveness: • 60–80% in preventing severe forms of tuberculosis (disseminated tuberculosis, meningitis), • effectiveness is highest in children.
Is vaccination mandatory? Tak — in Poland it is given to newborns in the first days of life.
Vaccination schedule: • 1 dose in the neonatal period. • Currently, booster doses are not performed.
Additional information: • The vaccine does not prevent all forms of tuberculosis, but significantly reduces the risk of the most severe complications. • In many countries with low incidence (e.g., USA), routine vaccinations are not used. • Adults traveling to high-risk areas may require individual medical assessment.
Tuberculosis is a serious infectious disease transmitted mainly by airborne droplets. It most often affects the lungs and can lead to severe complications, including organ damage and death. BCG vaccination protects children from the most dangerous forms of the disease, and awareness of symptoms and early diagnosis increase the chance of complete cure.
We especially encourage vaccination and consultation for: • people traveling to countries with high incidence, • people working in health care or care centers, • people with weakened immunity (after prior medical assessment).
It is best to plan preventive actions a few weeks before departure to ensure a safe trip.