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In a paper published this week in PNAS, University of Edinburgh scientists show that "the majority of S. aureus isolates from broiler chickens are the descendants of a single human-to-poultry host jump," which they believe happened about 38 years ago, by a subtype of a lineage from Poland. This ST5 clade has adapted to its new host through acquiring new mobile elements and inactivating several important human disease genes, they say.

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The Washington Post reports that the CDC's SARS-CoV-2 test issues reflect earlier ones it had with Zika virus testing.

NPR writes that even with thousands of new COVID-19 papers, each should be evaluated based on its own quality.

Researchers traced a gene cluster linked to COVID-19 severity to Neanderthals, the New York Times reports.

In PNAS this week: soil bacteria-derived small molecules affect centrosomal protein, microfluidics approach for capturing circulating tumor cells, and more.