Summary:
- The U.S. government has canceled its contract with Moderna to develop a vaccine for bird flu, also known as avian influenza.
- This decision comes as the threat of a bird flu pandemic has been increasing, with outbreaks reported in several countries around the world.
- The cancellation of the contract raises concerns about the preparedness of the U.S. to respond to a potential bird flu outbreak, as the development of a vaccine is crucial for protecting the population.