Scientists urge concern, not alarm over new virus strains

In this Nov. 24, 2020, file photo, registered nurse Chrissie Burkhiser works in the emergency room at Scotland County Hospital in Memphis, Mo. Scientists say there is reason for concern but not alarm about new strains of the coronavirus, especially the one currently spreading in England. (Jeff Roberson, AP File)

In this Nov. 24, 2020, file photo, registered nurse Chrissie Burkhiser works in the emergency room at Scotland County Hospital in Memphis, Mo. Scientists say there is reason for concern but not alarm about new strains of the coronavirus, especially the one currently spreading in England. (Jeff Roberson, AP File)

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