At least 21 states have recorded at least a 10% rise in daily average positive cases of Covid-19, according to Johns Hopkins University data Thursday, demonstrating that the fight against the pandemic is far from over.

In Michigan, hospitals are increasingly overwhelmed and reaching full capacities in part due to the influx of new coronavirus cases. State and local officials across the country are attempting to avoid a similar situation and are pushing to increase vaccination levels among adults, which shows continuing signs of improvement.

More than 30% of US adults have been fully vaccinated, according to the most recent data from the Centers for Disease Control and Prevention (CDC), and a CNN analysis has some states being able to vaccinate all willing adults by June.

However, between varying rates of vaccine hesitancy and the pace of vaccinations, the timeline for vaccinating all willing adults varies greatly among states -- a growing concern because, for some locations, a new surge may have arrived.

"We have knocked down this virus already three times, but we have to knock it down a fourth time," Washington Gov. Jay Inslee said Thursday, as the state's infection numbers have turned upwards again.