Tuberculosis (patient information)
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Tuberculosis |
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Tuberculosis On the Web |
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Assistant Editor(s)-in-Chief: Ethan Leeman
Overview
Tuberculosis, or TB is a bacterial infection that kills 3 million people worldwide, more people than any other infection in the world. Approximately one-third of the world is infected, and 15 million people in the US. Active tuberculosis kills 60% of the time if not treated, but treatment cures 90% of patients. Most people are infected with TB have latent TB. This means that the bacteria is controlled by the body's immune system. People with latent TB do not have symptoms and cannot transmit TB to other people. However, later if the infected person has a weakened immune system (AIDS, young children, elderly, sick with other diseases, etc.), the bacteria can break out leading to active TB, or TB disease.
What are the symptoms of Tuberculosis?
Latent TB is held in the alveoli of the lungs. As active TB develops, the bacteria spread out from the alveoli to the lungs and then to other organ systems. As a result, depending on which organ system is affected, the symptoms may be different. The primary stage of TB usually doesn't cause symptoms. When symptoms of pulmonary TB occur, they may include:[1]
- Cough (usually cough up mucus)
- Night sweats
- Coughing up blood
- Excessive sweating, especially at night
- Fatigue
- Fever
- Unintentional weight loss
Other symptoms that may occur with this disease:
- Breathing difficulty
- Chest pain
- Wheezing
Symptoms of TB disease in other parts of the body will depend on the affected area.
What causes Tuberculosis?
Pulmonary tuberculosis (TB) is caused by the bacteria Mycobacterium tuberculosis (M. tuberculosis). You can get TB by breathing in air droplets from a cough or sneeze of an infected person. This is called primary TB. In the United States, most people will recover from primary TB infection without further evidence of the disease. The infection may stay asleep or inactive (dormant) for years. However, in some people it can reactivate. Most people who develop symptoms of a TB infection first became infected in the past. However, in some cases, the disease may become active within weeks after the primary infection.
Multidrug-Resistant Tuberculosis
Multi-drug-resistant tuberculosis is caused by the bacterium Mycobacterium tuberculosis resistant to anti-TB drugs. This resistance can occur when drugs are misused or mismanaged:[1]
- When patients do not complete their full course of treatment
- When health-care providers prescribe the wrong treatment, the wrong dose, or length of time for taking the drugs
- When the supply of drugs is not always available
- When the drugs are of poor quality
Who is at highest risk?
Tuberculosis is spread from person to person through the air as person with active tuberculosis coughs or sneezes. Tuberculosis is not often spread on surfaces or by objects of a person infected with active tuberculosis, or by:
- Shaking hands
- Sharing food
- Kissing
- Sharing toothbrushes
The following people are at higher risk for active TB:
- Elderly
- Infants
- People with weakened immune systems, for example due to AIDS, chemotherapy, diabetes, or certain medications
Your risk of contracting TB increases if you:
- Are in frequent contact with people who have TB
- Have poor nutrition
- Live in crowded or unsanitary living conditions
The following factors may increase the rate of TB infection in a population:
- Increase in HIV infections
- Increase in number of homeless people (poor environment and nutrition)
- The appearance of drug-resistant strains of TB
Multidrug-Resistant Tuberculosis
Drug resistance is more common in people who:[2]
- Do not take their TB medicine regularly
- Do not take all of their TB medicine as told by their doctor or nurse
- Develop TB disease again, after having taken TB medicine in the past
- Come from areas of the world where drug-resistant TB is common
- Have spent time with someone known to have drug-resistant TB disease
When to seek urgent medical care?
Call your health care provider if:
- You have been exposed to TB
- You develop symptoms of TB
- Your symptoms continue despite treatment
- New symptoms develop
Diagnosis
Diagnosing active TB can be done with a combination of symptoms, patient history (any known exposure to TB), TB tests, and x-rays.
Latent tuberculosis can be detected about 6-8 weeks after exposure. There are two tests that can be used to help detect TB infection:[1]
- The skin test is used most often
- A small needle is used to put some testing material, called tuberculin, under the skin
- In 2-3 days, the patient should return to the health care worker, who will check if there is a reaction to the test
- In some cases, a TB blood test is used to test for TB infection
- This blood test measures how a person’s immune system reacts to the germs that cause TB
The drug resistance will be shown by a drug susceptibility test. To tell if someone has TB disease, other tests may be needed:[1]
- Chest x-ray - X-ray of the lungs often show can show cavities or lesions that are typical of TB
- Sample of sputum (phlegm that is coughed up from deep in the lungs)
It is important to tell your health care provider if you have ever had a “positive” reaction to a TB skin test or TB blood test, or if you have been treated with TB drugs in the past.
Treatment options
Typical treatment involves one or a few antibiotics for months. TB is notorious for having a lengthy treatment procedure. After two weeks of treatment, people are typically no longer contagious. Some of the medications given for TB have some negative side effects, especially in combination with other drugs. For these reasons, some patients find it very difficult to take their medicine for the necessary duration. However, doing so may make the bacteria resistant to the antibiotics and make treatment even more difficult in the future. Treatment for multi-drug-resistant tuberculosis or extensively drug-resistant TB have different treatments with far worse prognosis.
Multidrug-Resistant Tuberculosis
- TB is a treatable and curable disease. Treatment for multidrug-resistant tuberculosis must be confirmed by drug-susceptibility testing. However, since this testing can take weeks, treatment should be started with an empirical regimen based on expert advice as soon as drug-resistant TB disease is suspected. [1][2]
- When the testing results are known, the treatment regimen should be adjusted according to the results, in order to avoid suboptimal treatment. Patients should be monitored closely throughout treatment. [1]
- A common treatment regimen includes at least 4 drugs, to which the bacteria was shown to be susceptible.[3]
- Treatment regimens are commonly divided into 2 phases: the initial phase and the continuation phase.
- A fluoroquinolone is indicated in the treatment of patients with MDR-TB.
- Directly observed therapy should always be used in the treatment of drug-resistant TB to ensure adherence.[1]
Where to find medical care for Tuberculosis?
Directions to Hospitals Treating Tuberculosis
What to expect (Outlook/Prognosis)?
Symptoms often improve in 2 - 3 weeks. A chest x-ray will not show this improvement until later. The outlook is excellent if pulmonary TB is diagnosed early and treatment is begun quickly.
Possible complications
Pulmonary TB can cause permanent lung damage if not treated early. Medicines used to treat TB may cause side effects, including liver problems. Other side effects include:
- Changes in vision
- Orange- or brown-colored tears and urine
- Rash
A vision test may be done before treatment so your doctor can monitor any changes in your eyes' health over time.
Prevention
On an individual basis, covering coughs and sneezes does reduce transmission. On a larger scale, adequate ventilation and reduction of crowded areas can also reduce transmission. As with all infectious diseases, earlier identification of the disease is necessary to prevent spreading. A prophylactic antibiotic INH can cure latent TB before it progresses to active TB, and should be given to people who:
- Have latent TB
- Are close contact with known infected patients
- Live in countries where TB is prevalent.
- Are at risk of TB infection
A vaccine called BCG prevents the spread of TB to other parts of the body but not infection. It is recommended just for infants in countries known to have high levels of TB. It is not recommended for overall use in the US. BCG is known to interfere with TB skin tests, giving false positives, and other tests are needed to test for TB in these cases.
Sources
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "Tuberculosis Fact Sheet".
- ↑ 2.0 2.1 "Multidrug-resistant tuberculosis".
- ↑ Mandell, Gerald (2010). Mandell, Douglas, and Bennett's principles and practice of infectious diseases. Philadelphia, PA: Churchill Livingstone/Elsevier. ISBN 0443068399.