Medical Myths: All about tuberculosis
March 29, 2021

March 24 was World Tuberculosis Day, so in today’s edition of our Medical Myths series, we will focus on some of the misunderstandings associated with tuberculosis (TB). We cover the role of genetics, treatment, transmission, and more.

TB is a bacterial infection. It primarily affects the lungs, but it can also impact other parts of the body.

Symptoms include a chronic cough with bloody mucus, fever, and night sweats. Another common symptom is weight loss, which is why people used to call TB “consumption.”

The bacteria that cause TB, called Mycobacterium tuberculosisTrusted Source, spread from one individual to another through droplets expelled during coughing or sneezing. After transmission, the disease can progress in different ways, depending on the response of the host immune system.

TB has affected humans for thousands of years, and it is still one of the world’s deadliest communicable diseases. Each day, around 4,000 peopleTrusted Source die from it.

According to the World Health Organization (WHO), TB was responsible for 1.4 millionTrusted Source global deaths in 2019.

The WHO estimate that the global incidence of TB dropped by around 2% each year from 2015 to 2019. However, with a worrying rise in multidrug resistant TB, there is still a long way to go before scientists can eradicate this curable and preventable disease.

An estimated 1 in 4 people worldwide have a TB infection. However, only 5–15% of people with an infection will develop symptoms in their lifetime. When someone has an infection but does not experience symptoms, they have a latent TB infectionTrusted Source.

Today, there is still a significant stigmaTrusted Source attached to TB. By addressing some of the myths associated with TB, we might help slowly strip this stigma away.


1. Everyone with TB is infectious

This is untrue. Someone with TB can only transmit the infection if they develop symptoms. This means that someone with a latent infection cannot transmit TB.

Also, a person can only transmit TBTrusted Source when the bacteria are in the lungs or throat. If the bacteria are in other parts of the body, such as the kidney or spine, a person is unlikely to transmit the disease.

Generally, people with TB stop being infectious around 2–3 weeksTrusted Source after starting treatment.

2. TB is genetic

Although people used to believe that TB passed from parent to child, this is a myth.

This misconception may have arisen because people living in the same household often developed the disease. We now know that this is because their close proximity made it easier for the bacteria to spread from person to person.

However, there does appear to be a genetic componentTrusted Source to TB. However, rather than a gene being responsible for causing TB, it appears that some genes might influence whether or not someone will transition from a latent infection to an active infection.

3. There is no cure for TB

This is false; TB is treatable. The most common treatment for a latent TB infection is the antibiotic isoniazid. People with TB should take this drug as a single daily pill for 6–9 months.

For individuals with an active infection, doctors tend to prescribe a combination of antibacterial medications for 6–12 months. A common combination is isoniazid with rifampin, pyrazinamide, and ethambutol.

According to the Centers for Disease Control and Prevention (CDC), the Food and Drug Administration (FDA) have approved 10 drugsTrusted Source to treat TB.

People who have multidrug resistant TB may need to take at least six drugsTrusted Source to fight off the infection.

4. TB only affects people in low-income countries

This is a myth; TB can affect people anywhere in the world. However, there are certain regions wherein TB is more prevalent.

According to the WHO, in 2019, 44%Trusted Source of new TB cases occurred in South East Asia. Eight countries account for two-thirds of new cases: India, Indonesia, China, the Philippines, Pakistan, Nigeria, Bangladesh, and South Africa.

However, in the United States in 2019, there were 8,916Trusted Source cases of TB. In Europe in 2018, there were 52,862 cases.

5. TB spreads through shaking hands

TB is a serious illness, so people are understandably concerned about how it can spread. This has given rise to some myths.

TB cannot spreadTrusted Source through:

  • shaking hands
  • sharing foods or beverages
  • touching bed linen or toilet seats
  • kissing
  • sharing toothbrushes

TB can only spread when someone with an active infection in their lungs or throat coughs, sneezes, speaks, or sings.

6. TB is always fatal

This is not true. TB can be fatal without treatment, but with modern medicine, doctors can successfully treat the illness.

On March 24, 1882, Dr. Robert Koch announcedTrusted Source that he had discovered the bacteria responsible for causing TB. This discovery paved the way toward diagnosing and curing this illness. Almost 140 years on, the fight continues.




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