The fire department said in an alert the report came in just after 5 a.m. local time and that fire officials had "resources on standby to evaluate approximately."
In an update, fire officials said in total, 19 patients were treated for flu-like symptoms and all declined to be transported to the hospital. The department initially said a total of 20 passengers reported an "unspecified illness."
Last Sunday, the Norwegian Joy cruise ship was again docked at the port around 6 a.m. and six passengers were treated for flu-like symptoms.
The cruise ship, according to Norwegian's website, was built in 2017 and can host 3,804 guests and a crew of 1,821, and hosts cruises year-round.