More than 2,500 passengers on a cruise ship sailing in Europe have received antibiotics in the wake of an outbreak of bacterial meningitis on the vessel, industry watcher Seatrade Insider reports.

Seatrade Insider says four crew members of the MSC Orchestra were diagnosed with the illness and hospitalized after the ship’s arrival in Livorno, Italy on Sunday. One of the crew members is in serious condition, the news outlet says.

Seatrade Insider says the treatment of 2,723 passengers and more than 950 crew members was done as a precaution.

Tags: disease, italy