The U.S. had the fewest cases of tuberculosis cases ever recorded last year but thousands are still infected, federal officials said. While numbers have been going down a little each year, 9,412 cases reported last year, the smallest decline since 1992, the Centers of Disease Control and Prevention said. The U.S. has two sources of tuberculosis— people bringing it in from heavily affected countries and people living here who have latent infections that somehow become active infections. Globally, according to the World Health Organization, nine million people became infected with tuberculosis in 2013 and 1.5 million died from it. About a third of the world's population has latent tuberculosis.
