If life under quarantine was inconvenient or lonely, few were complaining. At least one person reportedly tried to leave the Riverside base before being stopped by officials, but evacuees said the group had settled into a routine.

Jarred Evans, 27, a football player from New York City who has been living in Wuhan for two years, said that staying at the base in Riverside for the full 14 days was “the most important thing we can do for the American people and the safety of our friends and family and community.”

Mr. Evans, who played for the Chinese National Football League champions, the Wuhan Berserkers, said that his group of evacuees had received daily updates about their health.

Another evacuee in Riverside described a genial atmosphere, despite the tense circumstances and lack of outside contact. There were Zumba classes, small business courses and a Super Bowl party on Sunday, complete with pizza, chicken wings and two big TV screens in a courtyard. A nonprofit organization, he said, had provided toys for children, as well as gourmet coffee and toiletries.

“Everybody’s O.K. here!,” Matthew McCoy, a theme-park designer who was on the first government-arranged flight out of Wuhan last week, said in an email. “We keep up with the news, other people’s work, and we all help each other as a group.”

Days in quarantine on military bases were expected as part of a strict protocol federal officials have put in place for the first time in about half a century to slow the spread of the outbreak.

Dr. Nancy Messonnier, director of the National Center for Immunization and Respiratory Diseases, part of the C.D.C., said she did not believe the evacuees posed a threat to the communities where they were being quarantined.