Fujifilm Holdings Corp. said it will start phase II clinical trials of its anti-flu drug Avigan for COVID-19 patients in the United States.

The trial will enroll about 50 COVID-19 patients in collaboration with Brigham and Women’s Hospital, Massachusetts General Hospital and the University of Massachusetts Medical School, Fujifilm said on Thursday.

On March 31, Fujifilm announced the start of a phase III clinical trial of Avigan for COVID-19 patients in Japan.