The coronavirus outbreak aboard a Princess Cruises ship quarantined in Yokohama showed no sign of abating on Wednesday as Japanese health authorities reported yet another 39 confirmed cases on board the ship.

The new cases bring the number of infections of the newly named COVID-19 virus on the Carnival Corp subsidiary's 115,900-gt Diamond Princess (built 2004) to 174.

In addition a Japanese quarantine official on board the ship has also reportedly tested positive for the disease.