The National Institutes of Health said it was reviewing the removal of genetic data about the Covid-19 virus from an agency-run archive after a scientist raised concerns about the episode earlier this summer. The data—a series of gene sequences from coronavirus samples obtained from Covid-19 patients in Wuhan in January and February 2020—could hold clues about the origin of the pandemic. The sequences were deleted from the Sequence Read Archive (SRA) last year at the request of one of the Wuhan University researchers who had originally provided them—a move that three Republican U.S. senators questioned in June in a sternly...