Mar 20, 2014 1:20 PM by NBC News
The number of tuberculosis cases in the United States has hit an all-time low.
A new report from the Centers for Disease Control and Prevention finds a 4% decline in cases between 2012 and 2013.
Although the lung infection is rare, the CDC says some populations are more at risk than others.
TB is higher in racial minority groups and those born in foreign countries.
Although the number of drug-resistant cases remains relatively small, it's a concern because drug-resistant TB is difficult and costly to treat and more often fatal.
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