An outbreak of tuberculosis in the Kansas City area has grown into one of the largest ever recorded in the United States, with dozens of active cases of the infectious disease reported, according to health officials.

A yearlong outbreak of tuberculosis in the Kansas City, Kansas area has taken local experts aback, even if it does not appear to be the largest outbreak of the disease in U.S. history as a state health official claimed last week.

State health officials said that dozens of people in the Kansas City, Kan., area have the disease, which has drawn a federal response.