Thousands of Americans voluntarily self-quarantine after returning from China
Many states monitoring travelers from China who have agreed to lie low for a few weeks out of an abundance of caution:
California - there are more than 5,400 such people in the state.
Washington - 745 people have been asked to self-quarantine.
Georgia - health officials identified about 200 travelers.
Michigan - more than 300 people were referred for monitoring.
Virginia - 138 residents are being monitored. "They were asked to remain at home and practice social distancing." Social distancing means avoiding public transportation (including taxis and ride-sharing) and large public gatherings and staying about 6 feet away from others.
Iowa - a total of 27 people are under voluntary self-quarantine
North Dakota - has 10 under voluntary self-quarantine.
Alabama - monitoring travelers, declined to provide exact numbers, which change daily as passengers continue to arrive home or finish their 14-day self-quarantine periods.
Indiana - monitoring travelers, declined to provide exact numbers, which change daily as passengers continue to arrive home or finish their 14-day self-quarantine periods.
Massachusetts - monitoring travelers, declined to provide exact numbers, which change daily as passengers continue to arrive home or finish their 14-day self-quarantine periods.
Texas - monitoring travelers, declined to provide exact numbers, which change daily as passengers continue to arrive home or finish their 14-day self-quarantine periods.
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Infectious disease experts say that while quarantines can help slow the spread of a virus, they can't necessarily stop it from spreading entirely.
"It's like Swiss cheese," said Dr. Gregory Poland, director of the Mayo Clinic's Vaccine Research Group in Rochester, Minnesota.
"It is going to leak out. You're just trying to prevent the tidal waves."