The Biden administration is sending medical teams to Michigan, which is at the forefront of the latest U.S. surge, accounting for around one in 10 new cases. Infections shot up by two-thirds last week, and hospitalizations increased by nearly 50% over the past two weeks. Just 54% of Michigan residents are fully vaccinated, lower than the national average of 59%. Unvaccinated people represent the vast majority of deaths and severe cases.