BERLIN (AP) — A German cruise ship operator says at least 76 people on a ship off the coast of Scotland have been infected with norovirus.

The Bremen-based Transocean Tours said on Tuesday that 54 passengers and 22 crew members were infected among the 1,109 people aboard the Marco Polo. Two of sick people were taken to a hospital after the ship docked at the Scottish port of Invergordon.

Norovirus is in a family of viruses that are spread from person to person and cause flu-like systems.

Transocean Tours spokesman John Will says the source of the outbreak was not known. The ship has not been quarantined.

Will says the company plans to continue the cruise pending the approval of British authorities.