Dr. Stuart Campbell Ray, an infectious disease expert at Johns Hopkins, said the current omicron variants have about 100 genetic differences from the original coronavirus strain.
Pandemic 3 years later: Has the COVID-19 virus won?
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“Without surveillance, it’s very hard to know what’s going on,” said Dr. Stuart Campbell Ray, an infectious disease expert at Johns Hopkins University.
As COVID surges in China, U.S. begins testing more travelers
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