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What is Tuberculosis?


Tuberculosis (TB) is a bacterial infection, spread by inhaling tiny droplets of saliva released through the cough or sneeze of an infected person. It affects the lungs primarily, but can spread to almost any part of the body. Before antibiotics, TB was a major problem and resulted in many deaths.

What causes it?

Tuberculosis is caused by a strain of bacteria called mycobacterium tuberculosis. It is spread when someone with an active infection in their lungs coughs or sneezes and another person inhales droplets of the saliva.

However, despite the fact that it is spread in the same way as Influenza (flu), TB is not as contagious, according to the NHS, and a person would usually need to spend a considerable amount of time in close contact with the patient before contracting it themselves.

It is therefore often spread between family members and others who live together. It is unlikely to get TB from sitting next to someone who is infected on the bus or train. The very young, elderly and those with pre-existing health conditions affecting their immune system (such as HIV/AIDS) are more likely to contract TB. The risk is also heightened for those who live in a community or have received visitors from a part of the world where TB is still commons.

What are the symptoms?

There are three types of TB and three ways in which the body could react to the infection. The NHS outlines these:

TB does not usually cause any symptoms until it reaches the lungs. As the bacteria are slow moving, it may take months or even years for any symptoms to surface. When they do, they commonly include, according to the BBC:

In some cases, TB can spread from the lungs to other parts of the body (this is called extrapulmonary TB) causing a host of different symptoms:

How is it treated?

It is important to seek immediate medical advice if you suspect that you may have TB. The illness takes a long time to leave the body and is usually treated through a course of different antibiotics over 6 months.

A vaccine is available and recommended to those who are more at risk of being exposed to the bacteria – by living with someone who has the illness, for example, or travelling to a country where TB is still common.

Click here to read about Nelson Mandela and his struggle following TB and the new hope of a cure for TB.

Images: Wikimedia Commons and EOL

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