Health-care companies fell as investors retreated from the sectors that have led the stock-market recovery.
While the tech sector has been the clear leader since the March lows on the stock market, the health-care sector has often been seen as the "best of the rest."
The Centers for Disease Control and Prevention reversed its controversial Covid-19 testing guidance on Friday, stating clearly that close contacts without any symptoms need a test.
The Lancet, a nearly-century old medical journal, announced changes to its peer-review process because of a retraction in June of a large study involving the antimalarial hydroxychloroquine as a Covid-19 treatment after the article's underlying data came under question, as reported earlier.
Write to Rob Curran at firstname.lastname@example.org