This Week in PNAS

Researchers with Cornell University and the Novartis Institutes for BioMedical Research report on a new virus that appears to contribute to Theiler disease, an acute form of hepatitis in horses that's transmitted via blood products. The team performed metatranscriptomic sequencing on blood serum samples from horses involved in a Theiler disease outbreak and on a plasma product given to horses before they became ill.

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Helix customers can purchase apps that interpret different aspects of their genome, Technology Review reports.

The New York Times reports that a number of companies and research institutes are pursuing gene therapies.

Salmon with shorter telomeres survive to make the trip back to their river homes, New Scientist reports.

In PLOS this week: vaginal microbiome composition, population patterns of Chagas-carrying Rhodnius ecuadoriensis, and more.