The US Department of Health and Human Services is terminating a contract with drugmaker Moderna to develop a vaccine to protect against bird flu amid the agency’s broader efforts to reevaluate therapies that use mRNA technology.

The Trump administration has canceled $766 million awarded to drugmaker Moderna Inc. to develop a vaccine against potential pandemic influenza viruses, including H5N1 bird flu.

The Trump administration has canceled a contract awarded to Moderna for the late-stage development of its bird flu vaccine for humans, as well as the right to purchase shots, the drugmaker announced on Wednesday.