Dozens of active and latent TB cases have been linked to the outbreak dating back to last year, local health officials say.

Health officials in Kansas say they are battling an “unprecedented” tuberculosis outbreak that’s infected at least 146 people in the state’s northeast. As of Friday, there have been 67 confirmed active cases of the bacterial disease,

The outbreak poses “very low risk to the general public, including the surrounding counties,” the Kansas Department of Health and Environment said.