CS232274_C

National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention 

Division of Tuberculosis Elimination

Tuberculosis (TB) Facts

You Can Prevent TB

What is TB?

“TB” is short for a disease called tuberculosis. TB is spread through 

the air from one person to another. TB germs are passed through the 

air when someone who is sick with TB disease of the lungs or throat 

coughs, speaks, laughs, sings, or sneezes. Anyone near the sick person 

with TB disease can breathe TB germs into their lungs.

TB germs can live in your body without making you sick. This is called 

latent TB infection. This means you have only inactive (sleeping) 

TB germs in your body. The inactive germs cannot be passed on to 

anyone else. However, if these germs wake up or become active in 

your body and multiply, you will get sick with TB disease.

When TB germs are active (multiplying in your body), this is called 

TB disease. These germs usually attack the lungs. They can also 

attack other parts of the body, such as, the kidneys, brain, or spine. 

TB disease will make you sick. People with TB disease may spread 

the germs to people they spend time with every day.

How do I know if I have been infected with 

TB germs?

If you have been around someone who has TB disease, you should 

go to your doctor or your local health department for tests.

There are two tests that can be used to help detect TB infection: a 

TB skin test or TB blood test. 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, you return to the health care worker who will 

check to see 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.

To tell if someone has TB disease, other tests such as chest x-ray and 

a sample of sputum (phlegm that is coughed up from deep in the 

lungs) may be needed.
Page 2 of 2

May 2012

TB Facts: You Can Prevent TB

What should I do if I have TB?

If you have latent TB infection, you may need medicine to prevent 

getting TB disease later. One or more drugs are used to treat latent 

TB infection. It is important that you take your medicine exactly as 

your doctor or health care worker tells you.

TB disease can also be treated by taking medicine. If you have 

TB disease, it is very important that you finish the medicine, and 

take the drugs exactly as you are told. If you stop taking the drugs 

too soon, you can become sick again. If you do not take the drugs 

correctly, the germs that are still alive may become difficult to treat 

with those drugs. If you have TB disease, it takes six months and 

possibly as long as one year to kill all the TB germs.

Remember, you will always have TB germs

in your body unless you kill them with the 

right medicine.

People who are more likely to get sick from TB disease include:

•	 those with HIV infection (the virus that causes AIDS);

•	 those who have been recently infected with TB 

(in the last two years);

•	 those who inject illegal drugs;

•	 babies and young children;

•	 elderly people;

•	 those who were not treated correctly for TB in the past; and

•	 those with certain medical conditions such as diabetes, 

certain types of cancer, and being underweight.

These people have conditions that make the body weaker, 

so it is difficult for them to fight TB germs.

Protect your family 

and friends from TB —

 take ALL your TB 

drugs!

http://www.cdc.gov/tb