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(TB) Tuberculosis Testing/X-Ray

ADPH TB Policy June 2011

Mission of the MCHD TB Control Program:

To control TB by rapidly identifying cases of TB in the community and ensuring they receive adequate treatment through the use of Directly Observed Therapy. In addition, program staff seeks out individuals exposed to infectious TB cases and evaluates them to halt disease transmission.

X-ray Hours

  • 7:30 to 4:00 (X-ray technician generally goes to lunch from 12:00 to 1:00)
  • The clinic's number is 251-690-8143


Tuberculosis (often called TB) is an infectious disease that usually attacks the lungs, but can attack almost any part of the body. Tuberculosis is spread from person to person through the air.

When people with TB in their lungs or throat cough, laugh, sneeze, sing, or even talk, the germs that cause TB may be spread into the air. If another person breathes in these germs there is a chance that they will become infected with tuberculosis.  Repeated contact is usually required for infection.

It is important to understand that there is a difference between being infected with TB and having TB disease. Someone who is infected with TB has the TB germs, or bacteria, in their body. The body's defenses are protecting them from the germs and they are not sick. This is referred to as latent TBI.

Someone with TB disease is sick and can spread the disease to other people. A person with TB disease needs to see a doctor as soon as possible. This is referred to as active TBII.

It is not easy to become infected with tuberculosis. Usually a person has to be close to someone with TB disease for a long period of time. TB is usually spread between family members, close friends, and people who work or live together. TB is spread most easily in closed spaces over a long period of time. However, transmission in an airplane, although rare, has been documented.

Even if someone becomes infected with tuberculosis, that does not mean they will get TB disease. Most people who become infected do not develop TB disease because their body's defenses protect them. Most active cases of TB disease result from activating old infection in people with impaired immune systems.

Experts believe that about 10 million Americans are infected with TB germs. Only about 10 percent of these people will develop TB disease in their lifetime. The other 90 percent will never get sick from the TB germs or be able to spread them to other people.1 

TB is an increasing and major world wide problem, especially in Africa where the spread has been facilitated by AIDS. It is estimated that nearly 1 billion people will become newly infected, over 150 million will become sick, and 36 million will die worldwide between now and 2020 -- if control is not further strengthened. Each year there are more than 9 million cases and close to 2 million deaths attributed to TB; 100,000 of those 2 million deaths occur among children.2 


Anyone can get TB. However, some groups are at higher risk to get active TB disease. The groups that are at high risk include:

  • People with HIV infection (the AIDS virus) 
  • People in close contact with those known to be infectious with TB 
  • People with medical conditions that make the body less able to protect itself from disease (for example: diabetes, the dust disease silicosis, or people undergoing treatment with drugs that can suppress the immune system, such as long-term use of corticosteroids)
  • Foreign-born people from countries with high TB rates 
  • Some racial or ethnic minorities 
  • People who work in or are residents of long-term care facilities (nursing homes, prisons, some hospitals) 
  • Health care workers and others such as prison guards
  • People who are malnourished 
  • Alcoholics, IV drug users and people who are homeless


A person with TB infection will have no symptoms. A person with TB disease may have any, all or none of the following symptoms:

  • A cough that will not go away
  • Feeling tired all the time
  • Weight loss
  • Loss of appetite
  • Fever
  • Coughing up blood
  • Night sweats

These symptoms can also occur with other diseases so it is important to see a doctor and to let the doctor determine if you have TB.

It is also important to remember that a person with TB disease may feel perfectly healthy or may only have a cough from time to time. If you think you have been exposed to TB, get a TB skin test.


There are two possible ways a person can become sick with TB disease:

The first applies to a person who may have been infected with TB for years and has been perfectly healthy. The time may come when this person suffers a change in health. The cause of this change in health may be another disease like AIDS or diabetes. Or it may be drug or alcohol abuse or a lack of health care because of homelessness.

Whatever the cause, when the body's ability to protect itself is compromised, TB infection can become active TB disease. In this way, a person may become sick with TB disease months or even years after they first breathed in the TB germs.

The other way TB disease develops happens much more quickly. Sometimes when a person first breathes in the TB germs the body is unable to protect itself against the disease. The germs then develop into active TB disease within weeks.


The TB skin test is a way to find out if a person has TB infection. Although there is more than one TB skin test, the preferred method of testing is to use the Mantoux test.3 

For this test, a small amount of testing material is placed just below the top layers of skin, usually on the arm. Two to three days later a health care worker checks the arm to see if a bump has developed and measures the size of the bump. The significance of the size of the bump is determined in conjunction with risk factors for TB.

Once the doctor knows that a person has TB infection he or she will want to determine if the person has TB disease. This is done by using several other tests including a chest X-ray and a test of a person's mucus (the material that is sometimes coughed up from the lungs).


Treatment for TB depends on whether a person has active TB disease or only TB infection.4 

A person who has become infected with TB, but does not have active TB disease, may be given preventive therapy. Preventive therapy aims to kill germs that are not doing any damage right now, but could so do.

If a doctor decides a person should receive preventive therapy, the usual prescription is a daily dose of isoniazid (also called "INH"); an inexpensive TB medicine. The person takes INH for nine months (up to a year for some patients), with periodic checkups to make sure the medicine is being taken as prescribed.

What if the person has active TB disease? Then treatment is needed.

Years ago a patient with TB disease was placed in a special hospital for months, maybe even years, and would often have surgery. Today, TB can be treated with very effective drugs.

Often the patient will only have to stay a short time in the hospital and can then continue taking medication at home. Sometimes the patient will not have to stay in the hospital at all. After a few weeks a person can probably even return to normal activities and not have to worry about infecting others.

The patient usually gets a combination of several drugs (most frequently INH plus two to three others including rifampin, pyrazinamide and ethambutol). The patient will probably begin to feel better only a few weeks after starting to take the drugs.

It is very important, however, that the patient continue to take the medicine correctly for the full length of treatment. If the medicine is taken incorrectly or stopped the patient may become sick again and will be able to infect others with TB. As a result, public health authorities recommend Directly Observed Therapy (DOT), in which a health care worker insures that the patient takes his/her medicine.

If the medicine is taken incorrectly and the patient becomes sick with TB a second time, the TB may be harder to treat because it has become drug resistant. This means that the TB germs in the body are unaffected by some drugs used to treat TB.

Multi-drug resistant TB is very dangerous, so patients should be sure that they take all of their medicine correctly.

Regular checkups are needed to see how treatment is progressing. Sometimes the drugs used to treat TB can cause side effects. It is important both for people undergoing preventive therapy and people being treated for TB disease to immediately let a doctor know if they begin having any unusual symptoms.


Multi-drug resistant tuberculosis (called MDR-TB for short) is a very dangerous form of tuberculosis. Some TB germs become resistant to the effects of some TB drugs. This happens when TB disease is not properly treated.

These resistant germs can then cause TB disease. The TB disease they cause is much harder to treat because the drugs do not kill the germs. MDR-TB can be spread to others, just like regular TB.

It is important that patients with TB disease follow their doctor's instructions for taking their TB medicine so that they will not develop MDR-TB.


Yes, if they have TB disease and it is not being treated. Once treatment begins, a patient ordinarily quickly becomes noninfectious; that is, they cannot spread the disease to others.

There is little danger from the TB patient who is being treated, is taking his or her medication continuously, and is responding well. The drugs usually make the patient noninfectious within weeks.

TB is spread by germs in the air, germs put there by coughing or sneezing. Handling a patient's bed sheets, books, furniture, or eating utensils does not spread infection.

Brief exposure to a source of TB rarely infects a person. It's day-after-day close contact that usually does it.


Find out if they are infected.

Certain people such as those infected with HIV or health care workers should be tested regularly by their private physicians or providers.

If the test is negative:

A negative reaction usually means that a person is not infected with TB and no treatment is needed. However, if a person has TB symptoms their doctor must continue to look for the cause.  Sometimes, when a person has only recently been infected, or when his or her immune system isn't working properly, the test may be falsely negative.

If the test is positive:

A significant reaction usually means that a person has been infected with the TB germ. It does not necessarily mean that they have TB disease. A person should cooperate with their doctor if a chest X ray and possibly other tests are recommended.

If the doctor recommends preventive treatment, the recommendations should be followed. Prescribed medicine should be taken as directed.

If a person is sick with TB disease, all recommendations for treatment should be followed.

If a person is a health worker:

The local American Lung Association can provide more comprehensive information developed for health professionals on the diagnosis, treatment and control of TB.


I. Definition of latent disease: Inactive disease. Person does not have symptoms.
II. Definition of active disease: Bacteria is active. Person has symptoms of TB and is infectious.


1. Centers for Disease Control and Prevention. Status of the Tuberculosis Epidemic in the U.S. July 1999.
2. World Health Organization. Global TB Control Report, 2003.
3. American Thoracic Society and Centers for Disease Control and Prevention.  Targeted Tuberculin Testing and Treatment of Latent Tuberculosis Infection.  American Journal of Respiratory and Critical Care Medicine. Vol. 161(4), April 2000.
4. American Thoracic Society, Centers for Disease Control and Prevention and Infectious Disease Society of America. Treatment of Tuberculosis. Morbidity and Mortality Weekly Report Vol. 52 (RR-11), 2003.

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