World Coronavirus Dispatch: US reports all-time high single-day surge

Europe's lockdowns threaten to squash fragile profit rebound, Regeneron halts trial of antibody treatment in seriously ill Covid patients, and other pandemic-related news across the globe

People who contract Covid-19 can quickly spread the virus through their households, the Centers for Disease Control and Prevention reported on Friday, based on a study of 101 patients in Tennessee and Wisconsin, and 191 of their household contacts.
 

And “substantial transmission” occurred, whether the first patient was an adult or a child, the researchers found. The transmission rate was high across all racial and ethnic groups.

The findings highlight the need for strict measures, even at home, to help control the spread of the disease. And they reinforce concerns raised by other studies and public health experts that parents