French researchers are using tiny antibody particles extracted from the family of animals that includes camels and llamas to produce a test they say can detect if patients have Covid-19 faster and more accurately than existing methods.

Deaths from Covid-19 in the United States fell for a third straight week during the week ended Feb. 21, as cases and hospitalizations showed steep drops.

Pfizer Inc. and BioNTech SE started an international study with 4,000 volunteers to evaluate the safety and effectiveness of their COVID-19 vaccine in healthy pregnant women.

The United States reported a 23% drop in new cases of Covid-19 and a 16% fall in the number of people hospitalized with the virus for the week ended Feb. 14, with both figures declining for a fifth week in a row.

A U.S. official told a World Health Organization meeting that Washington would participate in a program to boost Covid-19 testing, diagnostics and vaccines as the country joins global efforts to respond to the pandemic.

Thermo Fisher Scientific is acquiring Mesa Biotech for about $450 million in cash, and will pay an additional $100 million in cash after certain milestones are hit.

The United States lost more than 23,000 lives to Covid-19 during the week ended Jan. 17, setting a record for the third week in a row, though the number of new infections and the amount of patients in hospitals both fell from the previous seven days.

Alexion Pharmaceuticals Inc. paused enrollment in a late-stage study testing the company’s rare blood-disorder drug in adults with severe Covid-19 requiring mechanical ventilation.

The U.S. Food and Drug Administration authorized emergency use of the first over-the-counter Covid-19 antigen test, which can be used at home.

A Covid-19 vaccine being developed by CSL Ltd. and the University of Queensland was scrapped after numerous vaccine recipients reported receiving false positives on certain HIV tests, according to the Wall Street Journal.