CAPE CANAVERAL — Disney Cruise Line is postponing its first test cruise since the pandemic brought the cruise industry to a standstill after a handful of participants had inconsistent test results for COVID-19, the company said Monday.

The Disney Dream had been scheduled to set sail Tuesday from Port Canaveral, Florida, with 300 employees who had volunteered for the “simulation” cruise. But the trip was postponed until next month, pending approvals, because a small number of employees had inconsistent results for COVID-19, “which is considered positive by the CDC,” Disney said in a statement.

The Centers for Disease Control and Prevention, or CDC, had approved the cruise line’s request to conduct a two-night test cruise.

The federal government is starting to allow cruises to sail again, but only if nearly all passengers and crew are vaccinated against the virus. Republican Florida Gov. Ron DeSantis signed a bill banning business from requiring proof of vaccination, so cruise lines must prove the effectiveness of their COVID-19 safety protocols on test cruises.

On June 26 Celebrity Edge departed Fort Lauderdale, becoming the first cruise ship to leave a U.S. port in 15 months. Saturday’s sailing kicked off the cruise lines’ return to business with Carnival vessels already scheduled to depart from other ports early next month.

Celebrity Cruises said 99% of the passengers were vaccinated, well over the 95% requirement imposed by the CDC.