Is tuberculosis contagious?

Written by Yuan Lin Yan

Infectious Disease

Updated on September 27, 2024

00:00

00:00

Not all cases of tuberculosis are infectious. Some tuberculosis cases are infectious in the early stages but become non-infectious after proper treatment. Patients with open tuberculosis are highly contagious because their sputum contains tuberculosis bacilli. These bacilli can be released into the air through coughing, sneezing, laughing, or loud speaking, and can cause infection when inhaled by others. Some tuberculosis patients do not have detectable bacilli in their sputum, and their infectiousness is relatively much lower.

Other Voices

home-news-image

Written by Xiong Hong Hai

Infectious Disease

38sec

home-news-image

How is tuberculosis diagnosed?

The diagnosis of tuberculosis primarily involves combining relevant clinical symptoms, such as whether there is cough, expectoration, low fever, night sweats, and blood in phlegm. It also requires considering the patient's chest imaging features, whether there is obvious infection, fresh exudation, cavities, as well as sputum tests. For example, if the sputum stain for acid-fast bacilli is positive, and the sputum culture is positive, using these comprehensive diagnostic methods, tuberculosis can be diagnosed, after which anti-tuberculosis treatment should be initiated.

home-news-image

Written by Yuan Lin Yan

Infectious Disease

1min 21sec

home-news-image

Can tuberculosis be cured?

Tuberculosis can be cured if it is detected early and treated promptly with standard anti-tuberculosis therapy, resulting in a very good prognosis. However, it is very unfortunate if detection is delayed or if standard treatment is not administered, as the tuberculosis may recur or infect with drug-resistant strains, causing permanent damage to lung function. Advanced pulmonary lesions or significant hemoptysis can be life-threatening. Currently, the treatment of tuberculosis involves chemotherapy, with principles including early treatment, combination therapy, appropriate dosing, regularity, and completeness, usually lasting at least six months. Common first-line anti-tuberculosis medications include isoniazid, rifampin, ethambutol, and pyrazinamide. Initially, a two-month intensive phase of treatment with isoniazid, rifampin, ethambutol, and pyrazinamide is followed by a four-month continuation phase with isoniazid and rifampin. During the treatment of tuberculosis, it is important to enhance one's resistance and immune function and to improve nutrition to facilitate recovery. (Use medications under the guidance of a doctor.)

home-news-image

Written by Wang Xiang Yu

Pulmonology

38sec

home-news-image

Does tuberculosis cause fever?

Does tuberculosis cause fever? The answer is definitely yes. Fever is one of the most common clinical manifestations of tuberculosis. Many tuberculosis patients experience low fevers, and a minority of patients, such as those with caseous tuberculosis or tuberculous pleurisy, may experience high fevers that can recur and persist. Moreover, tuberculosis patients may sometimes also have concurrent bacterial infections, which can cause the fever to last longer and be more difficult to control.

home-news-image

Written by Han Shun Li

Pulmonology

41sec

home-news-image

Can people with tuberculosis eat lamb?

Tuberculosis is a very common infectious disease in our country. After contracting tuberculosis, symptoms often include coughing, phlegm, hemoptysis, chest pain, low fever, night sweats, fatigue, poor appetite, and weight loss. Generally speaking, as long as one is not allergic to mutton, it can be consumed. However, if the patient has significant poor appetite and weak digestive function, it is better to eat less or avoid mutton to prevent worsening the symptoms due to indigestion. If the digestive function is still relatively good, eating mutton is alright as it is nutritious and can provide energy, benefiting the patient's recovery.

home-news-image

Written by Han Jian Hua

Infectious Disease

1min 31sec

home-news-image

Does tuberculosis infect people?

Tuberculosis is a contagious disease, and hearing the term "tuberculosis" inevitably makes people nervous. However, not all tuberculosis patients are contagious. Research shows that among tuberculosis patients, only those who have tuberculosis bacteria found in sputum smear tests are contagious. With a source of infection, the tuberculosis bacteria must be transmitted to others through certain routes. Airborne transmission is the main route of transmission for tuberculosis bacteria. When a tuberculosis patient coughs, sneezes, or speaks loudly, they release a large number of droplet nuclei containing tuberculosis bacteria into the air, which can be inhaled by healthy individuals and cause infection. The degree of tuberculosis bacteria infection mainly depends on factors such as the amount of bacteria the patient expels, the severity of coughing symptoms, and the extent of contact. Therefore, when there is a tuberculosis patient nearby, we first need to understand whether they are in the active phase of the disease, that is, expelling bacteria, and whether they are undergoing anti-tuberculosis chemotherapy. If the patient has a negative sputum test or has undergone chemotherapy for a positive sputum test, such patients have very low contagiousness, so there is no need to worry too much about being infected.