Why Didn’t the U.S. Detect Omicron Cases Sooner?Genomic surveillance has improved enormously in recent months, but the system has built-in delays, and blind spots remain.http://rss.nytimes.com/services/xml/rss/nyt/Technology.xmlNYT > Technologyhttps://static01.nyt.com/images/misc/NYT_logo_rss_250x40.pngTechnology124Emily Anthes
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