Tuberculosis (popularly known as "TB") is a disease caused by the bacteria Mycobacterium tuberculosis. It mainly infects the lungs, although it also can affect other organs.
When someone with untreated TB coughs or sneezes, the air is filled with droplets containing the bacteria. Inhaling these infected droplets is the usual way a person gets TB.
One of the most dreaded diseases of the 19th century, TB was the eighth leading cause of death in children 1 to 4 years of age during the 1920s. As the general standard of living and medical care improved in the United States, the incidence of TB decreased. By the 1960s, it wasn't even in the top 10 causes of death among children of any age group.
But TB is making a comeback in the United States today — particularly among the homeless, those in prison, and those rendered susceptible because of HIV infection.
In older infants and children, latent tuberculosis infection (LTBI), which is the first infection with the tuberculosis bacteria, usually produces no signs or symptoms. In addition, a chest X-ray shows no signs of infection.
In most cases, only a tuberculin skin test (used to figure out if someone has been infected by the tuberculosis bacteria) is positive, indicating that the child has been infected. Children with a positive tuberculin test, even if they show no disease, will usually need to receive medication.
This primary infection usually resolves on its own as a child develops immunity over a 6- to 10-week period. But in some cases, it can progress and spread all over the lungs (called progressive tuberculosis) or to other organs. This causes signs and symptoms such as fever, weight loss, fatigue, loss of appetite, and cough.
Another type of infection is called reactivation tuberculosis. Here, the primary infection has resolved, but the bacteria are dormant, or hibernating. When conditions become favorable (for instance, due to lowered immunity), the bacteria become active.
Tuberculosis in older kids and adults may be of this type. The most prominent symptom is a persistent fever, with sweating during the night. Fatigue and weight loss may follow. If the disease progresses and cavities form in the lungs, the person might have coughing and the production of saliva, mucus, or phlegm that may contain blood.
The prevention of TB depends on:
New cases and potentially contagious patients are identified through proper use and interpretation of the tuberculin skin test.
A vaccine called BCG (Bacille Calmette-Guérin) is considered controversial because it isn't very effective in countries with a low incidence of TB. For this reason, BCG isn't usually given in the United States. However, it may be considered for kids emigrating to countries where TB is prevalent.
Tuberculosis is contagious when it's airborne and can be inhaled by others. In general, kids are not considered contagious, and usually get the infection from infected adults.
The incubation period (the time it takes for a person to become infected after being exposed) varies from weeks to years, depending on the individual and whether the infection is primary, progressive, or reactivation TB.
A doctor may recommend hospitalization for the initial evaluation and treatment of TB, especially if:
However, most kids with tuberculosis can be treated as outpatients and cared for at home. The treatment is usually in the form of oral medications. Rarely, three or four drugs may be prescribed. Even though treatment may require months to complete, it's vitally important that the full course of medications be taken in order for tuberculosis to be cured.
Tuberculosis is a chronic disease that can persist for years if it isn't treated.
Call the doctor if your child:
Reviewed by: Nicole A. Green, MD
Date reviewed: January 2014
|Centers for Disease Control and Prevention (CDC) The CDC (the national public health institute of the United States) promotes health and quality of life by preventing and controlling disease, injury, and disability.|
|Tuberculosis Tuberculosis (TB) is making a comeback in the United States today - particularly among the homeless, those in prison, and those rendered susceptible because of HIV infection.|
|Fever and Taking Your Child's Temperature Although it can be frightening when your child's temperature rises, fever itself causes no harm and can actually be a good thing - it's often the body's way of fighting infections.|
|HIV and AIDS Parents who are well informed about how to prevent HIV and who talk with their kids regularly about healthy behaviors, feelings, and sexuality play an important part in HIV/AIDS prevention.|
|Pneumonia Pneumonia is a lung infection that can be caused by different types of germs, most commonly viruses. Read about the various types of pneumonia.|
|Immunizations Missing out on shots puts you at more serious risk than you might think. That one little "ouch" moment protects you from some major health problems.|
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