Over 70 people aboard a 13-day Royal Caribbean cruise have reportedly fallen ill from norovirus ahead of its final destination in Miami, the Centers for Disease Control and Prevention reported. The program is set to help prevent and control the introduction and spread of gastrointestinal illnesses on cruise ships. "The health and safety of our guests, crew, and the communities we visit are our top priority," a Royal Caribbean Group spokesperson told NBC News. There have been 19 gastrointestinal outbreaks on cruise ships so far this year, 14 of which were caused by norovirus, as recorded by the CDC. They can spread quickly in closed and semienclosed environments, such as cruise ships," the CDC said.