When an outbreak occurs, people whose symptoms met the case definition are asked to provide stool or vomitus samples. These samples are tested to determine the causative agent," the agency continued.

Over 90 people contracted gastrointestinal illnesses from an unknown source on a week-long Royal Caribbean cruise, the CDC said Charlotte Phillipp is a Weekend Writer-Reporter at PEOPLE. She has ...

“Finding the agent that caused an outbreak (causative agent) can take time. When an outbreak occurs, people whose symptoms met the case definition are asked to provide stool or vomitus samples. These ...

They speculate that it could be norovirus, which they describe as a common cause of gastrointestinal illness on cruise ships, but they say they are unable to confirm that until they receive stool or ...

The Centers for Disease Control and Prevention (CDC) has logged six gastrointestinal illness outbreaks on cruise ships — three of which were attributed to Norovirus — so far in 2025. The ...