The Trump administration has delivered its latest blow to vaccines, canceling a nearly $600-million contract to the drugmaker Moderna that was intended to develop a shot for humans against bird flu.

The U.S. Department of Health and Human Services has pulled $600 million in funding it had previously promised to pharmaceutical company Moderna to develop a vaccine for bird flu in humans, citing con...

Moderna received notice that HHS will terminate the award for the late-stage development and right to purchase pre-pandemic influenza vaccines.