Is tuberculosis contagious?

Written by Xiong Hong Hai

Infectious Disease

Updated on December 24, 2024

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Actually, not all cases of tuberculosis are contagious; only those in which tuberculosis bacteria can be found in the sputum are infectious. Many cases are non-infectious.

Among all cases of active tuberculosis, only about 30% have detectable tuberculosis bacteria in their sputum. The remaining 70% do not have detectable tuberculosis bacteria and thus are not contagious.

Whether tuberculosis is contagious or not, once the diagnosis of tuberculosis is confirmed, scientific and rational comprehensive anti-tuberculosis treatment is required.

Other Voices

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Written by Wang Xiang Yu

Pulmonology

1min 13sec

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What is tuberculosis?

Tuberculosis is a disease where the bacterium Mycobacterium tuberculosis infects the lungs. It is a persistent bacterium that grows slowly. Tuberculosis is an infectious disease and quite common historically, often referred to as consumption in the past, as mentioned in the novels of Lu Xun. In modern times, tuberculosis is relatively manageable if the infection has not developed resistance to drugs. Proper anti-tuberculosis treatment can result in a cure rate exceeding 90% on the first attempt. However, if the treatment is not adhered to correctly—if the patient stops taking the medication prematurely or does not follow the prescribed regimen—the bacteria may develop resistance, reducing the effectiveness of the treatment. This is particularly problematic in elderly patients, who might also experience adverse reactions to tuberculosis medications, making treatment difficult. Thus, while tuberculosis is generally treatable, infections with drug-resistant strains can be fatal if not managed properly.

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Written by Wang Xiang Yu

Pulmonology

1min 5sec

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How is tuberculosis transmitted?

How is pulmonary tuberculosis transmitted? First, we need to know the pathogen of pulmonary tuberculosis, which is the tuberculosis bacillus. Tuberculosis bacillus is a type of bacterium that can live in our surrounding environment. Pulmonary tuberculosis also needs a source of infection, that is, a patient carrying the tuberculosis bacillus. The most common source of tuberculosis infection is usually patients with secondary pulmonary tuberculosis. Then, its mode of transmission mainly includes coughing, sneezing, laughing, and talking loudly, which can release the tuberculosis bacilli from the patient into the air, spreading them through droplets. Droplet transmission is the most important route for the spread of pulmonary tuberculosis. Additionally, pulmonary tuberculosis can also be transmitted through other routes such as the gastrointestinal tract or the skin, although these methods of transmission are less common.

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Written by Wang Xiang Yu

Pulmonology

56sec

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Does tuberculosis cause coughing?

Do tuberculosis patients cough? Most tuberculosis patients can experience coughing, and the duration of the cough is generally quite long, often exceeding two to three weeks and in some cases even reaching over six months to a year. However, there is also a small number of patients who might not cough due to the different types of tuberculosis they have. Additionally, not all cases of coughing indicate tuberculosis. A tuberculosis patient might cough, but they might also not cough, and while a person who coughs could possibly have tuberculosis, not all coughs are due to tuberculosis. There is no definitive equivalence between tuberculosis and coughing. I hope this explanation helps you understand the relationship between tuberculosis and coughing. Thank you.

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Written by Xiong Hong Hai

Infectious Disease

42sec

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Is tuberculosis contagious?

Tuberculosis (TB) is only infectious in some patients who have a large amount of tubercle bacilli in their sputum. In fact, many patients with active pulmonary tuberculosis are not infectious. For more patients with active pulmonary tuberculosis, tubercle bacilli cannot be found in their sputum, so the actual situation must be considered. In fact, to determine if pulmonary tuberculosis is infectious, it is simple: look for acid-fast bacilli in the sputum. If the sputum acid-fast staining is positive, it indicates infectiousness. Infectious pulmonary tuberculosis requires systematic and standardized anti-tuberculosis treatment.

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Written by Wang Chun Mei

Pulmonology

56sec

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Does tuberculosis cause headaches in its initial stage?

Tuberculosis is a highly contagious respiratory disease caused by the infection of Mycobacterium tuberculosis in the lungs, generally transmitted through respiratory droplets or direct contact. When infected with tuberculosis, symptoms that often appear include low-grade fever in the afternoons, coughing, expectoration, hemoptysis, chest pain, chest tightness, and shortness of breath. Some may experience weight loss, fatigue, and night sweats. Therefore, when patients with pulmonary tuberculosis exhibit an afternoon low-grade fever, it often leads to the occurrence of headaches. Therefore, it is very common for patients in the early stages of pulmonary tuberculosis to exhibit various symptoms, primarily due to the rise in body temperature.