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In the 24 hours after the first confirmed case of coronavirus in Nebraska, health officials scrambled to identify those who could have come in contact with the 36-year-old Omaha woman.

Saturday afternoon, the list was only beginning to take shape. Participants at a Special Olympics basketball event in Fremont on Feb. 29. Supper-time guests Wednesday at a VFW club in northwest Omaha. Health care workers in Omaha who provided treatment before a diagnosis was known.

Officials across eastern Nebraska are asking those people — perhaps numbering in the hundreds — to self-quarantine in a move to prevent the spread of COVID-19.

The Centers for Disease Control and Prevention and local health departments are recommending the action as the Nebraska Department of Health and Human Services continues to try to identify those who would have come in contact with the patient before she was placed in isolation Friday.

The woman is believed to have contracted COVID-19 while traveling with her father in the United Kingdom from Feb. 18-27, according to Dr. Robert Penn, an epidemiologist at Methodist Hospital in Omaha.

She was transferred Friday to University of Nebraska Medical Center, where she was in critical condition Saturday, officials said.