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.

The U.S. Food and Drug Administration granted full approval to Orphalan’s Cuvrior (trientine tetrahydrochloride) for the treatment of Wilson’s disease, a rare genetic disorder. The approval announcement marks the first new treatment available for patients in over five decades.

Shares of Vertex Pharmaceuticals fell in trading after the company announced it will not advance a novel small molecule corrector of the Z-AAT protein into a Phase III study for a rare disease that can lead to complications of the liver and lungs.

The U.S. Food and Drug Administration identified 63 cases of worsening liver function in certain patients taking hepatitis C medicines made by drugmakers Merck & Co. Inc., Gilead Sciences Inc. and AbbVie Inc.

Gilead Sciences Inc. said Kite Pharma Inc., the cancer-focused cell therapy company acquired in 2017, will become a separate business unit.

Pfizer acquired a 15 percent stake in Vivet Therapeutics as well as an exclusive option to fully acquire the business, a deal that will give the New York-based pharma giant access to the French company’s experimental gene therapy for a rare genetic disorder.