Tuberculosis (TB), once called consumption, is a highly infectious disease that primarily affects the lungs. Tuberculosis (TB) is a disease caused by bacteria called Mycobacterium tuberculosis. The bacteria usually attack the lungs, but they can also damage other parts of the body. TB spreads through the air when a person with TB of the lungs or throat coughs, sneezes, or talks. Tuberculosis is usually preventable and curable under the right conditions.
Some people are infected with the TB bacteria but don’t experience symptoms. This condition is known as latent TB. TB can stay dormant for years before developing into active TB disease.
Active TB typically causes many symptoms that are most commonly related to the respiratory system, including coughing up blood or sputum (phlegm). You may experience a cough that lasts for over three weeks and pain when coughing or with normal breathing.
Other symptoms include:
- unexplained fatigue
- fever
- night sweats
- appetite loss
- weight loss
While TB usually affects the lungs, it can also affect other organs, such as the kidneys, spine, bone marrow, and brain. Symptoms will vary depending on which organ is infected. For example, tuberculosis of the kidneys can cause you to urinate blood.
According to WHO , more than 95 percent of all deaths related to TB cases occur in low- and middle-income countries.
People who use tobacco or misuse drugs or alcohol long term are more likely to get active TB, as are people diagnosed with HIV and other immune system issues. TB is the leading killer of people who are HIV-positive, according to WHO . Other risk factors for getting active TB disease include:
- diabetes
- end-stage kidney disease
- malnourishment
- certain cancers
Medications that suppress the immune system can also put people at risk for developing active TB disease, in particular medications that help prevent organ transplant rejection. Other medications that increase your risk of getting TB include those taken to treat:
- cancer
- rheumatoid arthritis
- Crohn’s disease
- psoriasis
- lupus
Traveling to regions where TB rates are high also increases your risk of contracting the infection. These regions include:
- sub-Saharan Africa
- India
- Mexico and other Latin American countries
- China and many other Asian countries
- parts of Russia and other countries of the former Soviet Union
- islands of Southeast Asia
- Micronesia
A bacteria called Mycobacterium tuberculosis causes TB. There are a variety of TB strains, and some have become resistant to medication.
TB bacteria are transmitted through infected droplets in the air. Once they’re in the air, another nearby person can inhale them. A person who has TB can be transmitted the bacteria via:
- sneezing
- coughing
- speaking
- singing
People with well-functioning immune systems may not experience TB symptoms, even though they are infected with the bacteria. This is known as latent or inactive TB infection. According to WHO , about one-quarter of the world’s population has latent TB.
Latent TB isn’t contagious, but it can become an active disease over time. Active TB disease can make you and others sick.
Many bacterial infections are treated with antibiotics for a week or two, but TB is different. People diagnosed with active TB disease generally have to take a combination of medications for six to nine months. The full treatment course must be completed. Otherwise, it’s highly likely a TB infection could come back. If TB does recur, it may be resistant to previous medications and be much more difficult to treat.
Your doctor may prescribe multiple medications because some TB strains are resistant to certain drug types. The most common combinations of medications for active TB disease include:
- isoniazid
- ethambutol (Myambutol)
- pyrazinamide
- rifampin (Rifadin, Rimactane)
- rifapentine (Priftin)
These particular medications can affect your liver, so people taking TB medications should be aware of liver-injury symptoms, such as:
- appetite loss
- dark urine
- fever lasting longer than three days
- unexplained nausea or vomiting
- jaundice, or yellowing of the skin
- abdominal pain
Notify your doctor immediately if you experience any of these symptoms. You should also have your liver function checked with frequent blood tests while taking these medications.
Most people in high-risk regions around the world receive TB vaccinations as children. The vaccine is called Bacillus Calmette-Guerin, or BCG, and protects against only some TB strains. The vaccine isn’t commonly given in the United States.
Having the TB bacteria doesn’t necessarily mean you’ll have symptoms of active TB. If you do have the infection and don’t show symptoms, you likely have latent TB. Your doctor may recommend a shorter course of antibiotics to keep it from developing into active TB disease. Common medications for latent TB include isoniazid, rifampin, and rifapentine, which may need to be taken for three to nine months, depending on the medications and combinations used.
People who’ve been diagnosed with active TB should avoid crowds until they are no longer contagious. According to WHO , people with active TB can infect 10 to 15 people through close contact per year if they don’t take precautions.
People who are infected with active TB should also wear a surgical mask, known as a respirator, to keep TB particles from spreading through the air.
It’s best that a person with active TB avoid contact with others and continuing wearing a mask until instructed otherwise by their doctor.
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