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In Science's early online edition, researchers performed a genome-wide RNAi screen in Drosophila to find genes for susceptibility or resistance to intestinal infection by the bacteria Serratia marcescens. Screening on organism- and tissue-specific levels, they found that the JAK-STAT signaling pathway "controls host defense in the gut by regulating stem cell proliferation and thus epithelial cell homeostasis," they say.

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SARS-CoV-2 vaccine developers are evaluating further vaccine doses as well as modified doses to keep up with new viral variants, according to CNN.

The New York Times reports that a new viral variant of concern has been identified in New York City.

In Nature this week: spatiotemporally resolved map of the human cell cycle, folding single-cell RNA sequencing into cancer drug studies, and more.

CNN reports that a US Food and Drug Administration document says Johnson & Johnson's SARS-CoV-2 vaccine meets the requirements to receive an Emergency Use Authorization.