Bug hits cruise ship passengers

Passengers on the Explorer of the Seas were hit with a bug on the way to Sydney. Photo / Supplied

A holiday has gone horribly wrong for almost 200 passengers on a cruise ship that sailed from New Zealand to Sydney.

A bug has struck passengers.

Ambulances were on hand as the Royal Caribbean ship Explorer of the Seas docked at Circular Quay this morning.

The ship is due to take on new passengers for another cruise this afternoon -- but it will undergo extra cleaning first to control the outbreak.