Those health officials pronounced that 10 persons on board were diagnosed as having coronavirus, later known as COVID-19. The ship was ordered quarantined for 14 days. Nobody could leave the ship during the quarantine period. Within 3 days another 125 passengers were diagnosed with having COVID-19). By February 13, a total of 218 people were diagnosed with having COVID-19.
A little known fact is that the Diamond Princess was sporting some new high tech 5G towers. An earlier news release explained that "Princess Cruises has announced a new dimension in its connectivity partnership with SES and will become the first global cruise ship fleet with early access to SES's O3b mPOWER network augmenting the Princess Medallion Class experience as it scales across the fleet, according to a press release." Cruise Industry News, February 3, 2020.