When used in children, rapid antigen tests for detecting the coronavirus do not meet accuracy criteria set by the World Health Organization and U.S. and UK device regulators, according to researchers who reviewed 17 studies of the tests. Other research appears to confirm smaller, earlier studies that suggested nursing mothers are unlikely to transmit the coronavirus in breastmilk.

The United States reported nearly 1 million new coronavirus infections on January 3, the highest daily tally of any country in the world and nearly double the previous U.S. peak set one week earlier as the spread of the Omicron variant showed no signs of slowing.

Covid-19 antibodies passed from infected mothers to their breastfeeding newborns provide more benefit to the baby than researchers expected to see, according to a report published on November 3 in JAMA Network Open. In other research, among people with impaired immune systems, some get less benefit than others from the mRNA Covid-19 vaccines while new data help clarify the differences and supports the need for extra shots.

The UK Health Security Agency designated a Delta coronavirus subvariant called AY.4.2 as a “Variant Under Investigation,” saying there was some evidence that it could be more transmissible than Delta.

A new study on Covid-19 behavior has found that patients affected by the virus might have died due to a buildup of coronavirus directly in the lungs and not because of a secondary infection. 

U.S. scientists are expanding a government-funded study that aims to directly answer the question of whether Moderna Inc.’s Covid-19 vaccine curbs the spread of SARS-CoV-2.

The U.S. Centers for Disease Control and Prevention (CDC) on May 13 advised that fully vaccinated people do not need to wear masks outdoors and can avoid wearing them indoors in most places, updated guidance the agency said will allow life to begin to return to normal. Reuters lays out some of recent scientific evidence on which the CDC and Director Rochelle Walensky based their updated guidelines, including vaccine efficacy against virus variants, increased availability and a reduction in cases.

Nearly 40 percent of all global deaths from Covid-19 reported last week happened in the Americas, and nearly 80 percent of the region’s intensive care units are filled with Covid-19 patients, the Pan American Health Organization said on May 12.

Covid-19 vaccines deployed in England can cut transmission of the coronavirus in households by up to a half, data from Public Health England (PHE) showed on April 28, in addition to the protection the shots offer against symptomatic infection.

Regeneron Pharmaceuticals announced results from the company’s Phase III trial of recently infected asymptomatic Covid-19 patients for the REGEN-COV (casirivimab with imdevimab) antibody cocktail.