A man inquires about a test for coronavirus disease (COVID-19) in a mobile test car in Brooklyn, New York, United States on June 2, 2021. Brendan McDermid | Reuters Quidel is recalling its Lyra Covid-19 assay test due to a high risk of false negative results in patients who actually have high levels of the…

People wearing protective masks shop in a Walmart store on May 18, 2021 in Hallandale Beach, Florida. Joe Raedle | Getty Images As the highly transmissible delta Covid variant continues to spread rapidly across the United States and elsewhere around the world, scientists and other health experts are warning that indoor mask mandates and other…

Here are the most important news, trends and analysis that investors need to start their trading day: 1. Dow to recover some of the losses in Thursday’s sell-off Traders on the floor of the New York Stock Exchange. Source: NYSE Dow futures bounced more than 200 points Friday, one day after a broad sell-off on…

The writer of “Bad Blood” has not finished telling the Theranos story. Three years after his bestseller was published, John Carreyrou is releasing a new podcast to uncover the final chapter of former Theranos CEO Elizabeth Holmes. “Bad Blood: The Final Chapter” follows the upcoming trial against Holmes. In an interview with CNBC, Carreyrou shared…

Medical staff from the Delta Health Center will be waiting on Jan. Spencer Platt | Getty Images Mississippi state health officials issued new guidelines Friday urging state residents over 65 and immunocompromised residents, vaccinated or unvaccinated, to avoid indoor mass gatherings for the next two weeks “significant transfer” of the Delta variant in the coming…

Students wearing masks listen to teacher Dorene Scala during summer third grade school at Hooper Avenue School on June 23, 2021 in Los Angeles. Carolyn Cole | Los Angeles Times | Getty Images The Centers for Disease Control and Prevention updated their public health guidelines for schools on Friday, saying that fully vaccinated teachers and…

Health workers inoculate a woman in Peru. DIEGO RAMOS | AFP | Getty Images More than 18 months into the Covid-19 pandemic and the world is used to news of new variants of the virus by now, particularly those that have, one by one, supplanted previous versions of the disease. Some mutations of the virus,…

Pfizer and BioNTech announced Thursday that they are developing a Covid-19 booster vaccine that will target the Delta variant amid concerns about the highly communicable strain that is already the predominant form of the disease in the United States. The companies said that while they believe a third vaccination of their current two-dose vaccine has…

Here are the most important news, trends and analysis that investors need to start their trading day: 1. Dow to drop 500 points as Covid concerns resurface Traders work on the floor of the New York Stock Exchange. Brendan McDermid | Reuters Dow futures on Thursday fell nearly 500 points, or more than 1.3%, in…

Covid-19 vaccines from Chinese companies Sinopharm (left) and Sinovac arrived at Phnom Penh International Airport in Cambodia on June 8, 2021. Sovannara | Xinhua News Agency | Getty Images Among the countries with both high vaccination rates and high Covid-19 infection rates, most rely on vaccines made in China, a CNBC analysis shows. The results…