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.

The Kansas City area is facing one of the country’s largest outbreaks of tuberculosis in recent years. According to the Kansas Department of Health and Environment, as of Jan. 24, there have been 67 confirmed cases of active TB in the state,