dangerous strain of tuberculosis

Washington — For the second time this year, the federal government has failed to stop a man infected with a dangerous strain of tuberculosis from traveling in and out of the United States. U.S. officials last spring were unable to catch a Mexican man infected with the disease because the doctor treating the man did not know his real name, according to a government official who was briefed on the incident but requested anonymity because the official was not authorized to discuss it publicly.