Corbett said Friday that the three people aren't showing symptoms of Ebola and aren't being quarantined.
He says the U.S. Centers for Disease Control and Prevention interviewed them and they are free to return to Pennsylvania. The state's isn't disclosing personal information about them.
Corbett's health secretary, Michael Wolf, says state epidemiologists are in contact with the three residents and will know if they return to Pennsylvania.
Wolf also says his agency is assembling an inventory of hospital equipment that could be marshaled to respond in case of a suspected Ebola case in Pennsylvania.