A chain of events possibly triggered by unrecognized infection with the SARS-CoV-2 coronavirus could be causing the mysterious cases of severe hepatitis reported in hundreds of young children around the world, researchers suggest.

Hundreds of thousands of people inside Ukraine were cut off from life-saving aid due to the military encirclement of cities, a U.N. report said on March 7, calling urgently for safe passage.

Ukraine is facing problems distributing medicines to pharmacies and hospitals due to the Russian invasion and wants to establish a humanitarian corridor for them, Health Minister Oleh Lyashko said on March 2.

Ukraine is running out of oxygen supplies that critically ill people need, the World Health Organization said on February 27, calling for safe passage for emergency imports as combat rages.

The U.S. Food and Drug Administration gave an emergency use authorization to the antibody treatment developed by Vir Biotechnology and GlaxoSmithKline for treating mild-to-moderate Covid-19 in people aged 12 years and older.

The European Union’s drug regulator said on May 21 a Covid-19 antibody treatment developed by GlaxoSmithKline and Vir Biotechnology can be used to treat patients who are at risk of severe disease and do not need supplemental oxygen.

India recorded the world’s highest daily tally of 314,835 Covid-19 infections on April 22 as a second wave of the pandemic raised new fears about the ability of crumbling health services to cope.

Eli Lilly and Co. and Incyte Corp. said their rheumatoid arthritis drug baricitinib did not meet the main goal of preventing progression to mechanical ventilation in hospitalized Covid-19 patients under a late-stage study.

Regeneron Pharmaceuticals Inc. said initial data from an ongoing study of the company’s experimental antibody cocktail for use in hospitalized Covid-19 patients requiring low-flow oxygen show the therapy was sufficiently effective to warrant continuing the trial.

A roundup of some of the latest scientific studies on the novel coronavirus and efforts to find treatments and vaccines for Covid-19, the illness caused by the virus.