People who attended a total solar eclipse event at a children's museum in Indiana may have been exposed to measles, according to museum and health officials. Melissa McMasters, administrator of infectious disease and immunizations at the MCPHD, told ABC News the local county department was informed about the infected patient from the state Department of Health. "Measles is one of those reportable diseases that's required to be reported by law because of the public health significance of it," she said.