People are at increased
risk of infection with
tuberculosis (TB) when they:
Have close contact (such as living in the same
house) with someone who has active TB, which can be spread to others. Active TB
is very contagious.
Are health professionals who may care for
people with untreated TB.
Live or work in crowded conditions where they can come into
contact with people who may have untreated active TB. This includes people who
live or work in prisons, nursing homes, military barracks, or homeless
Have poor access to health care, such as homeless people,
migrant farm workers, or people who abuse alcohol or drugs.
to or from regions where untreated TB is common, such as Latin America
(countries in Central America, South America, and the Caribbean), Africa, Asia,
Eastern Europe, and Russia.
People who have an infection that cannot spread to others
(latent TB infection) are at risk of developing active
TB if they:
Recommended Related to Lung Disease/Respiratory Problems
Bronchitis makes you cough -- a lot. It can make it hard to breathe, too, and can cause wheezing, fever, tiredness, and chest pain. The disease happens when the lining of the airways in your lungs gets irritated.
impaired immune system. The immune system may be
weakened in older adults, newborns, women who are pregnant or have recently given birth, and
people who have
HIV infection, some cancers, or poorly controlled
Have poor access to health care, such as homeless people, migrant
farm workers, or people who abuse alcohol or drugs.
Take some types
of medicines, such as long-term
corticosteroids, tumor necrosis factor-alpha
antagonists (used to treat
rheumatoid arthritis or
Crohn's disease), or medicines to prevent rejection of
a transplanted organ.
Have a chronic lung disease caused by breathing in tiny sand or
silica particles (silicosis) or
This information is produced and provided by the National
Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National
Institute via the Internet web site at http://
.gov or call 1-800-4-CANCER.
WebMD Medical Reference from Healthwise
April 04, 2013
This information is not intended to replace the advice of a doctor.
Healthwise disclaims any liability for the decisions you make based on this