Actually the upper limit to be considered a temperature is 100.4 which converts to 38 degrees Celsius.
Normal temperature of 98.6 converts to 37 degrees Celsius.
This was Celebrity"s policy back in early March:
"Effective Friday, March 6, mandatory temperature screenings will be conducted for all guests, crewmembers, and visitors prior to boarding any vessel. Your temperature will be taken via a noninvasive digital scan. If your temperature registers above 100.4°F (38° C), you and your traveling companions will be referred to a secondary health screening.