Montana public health officials have found five cases of measles in Gallatin County, the first cases of the disease in the Treasure State in more than three decades. Gallatin County is home to the state's fourth most populated city " Bozeman " and is the second most populated county in the state. A handful of children and adults contracted the disease while traveling outside of Montana, according to the state's Department of Public Health and Human Services (DPHH), leading to the state's first measles cases since 1990. All of them are isolating at home and are either unvaccinated or their measles vaccine status is unknown, according to officials. "While it is unfortunate to have cases of measles after 35 years of disease inactivity in Montana, we have been working diligently with our local partners to prepare," Maggie Cook-Shimanek, DPHHS's public health physician, said in a statement.