"More people in the United States are being vaccinated every single day at an accelerated pace," Centers for Disease Control and Prevention (CDC) Director Dr. Rochelle Walensky said on Monday.

"On the other hand, cases and hospitalizations are increasing in some areas of the country and cases among younger people who have not yet been vaccinated are also increasing."

In the past seven days, the US averaged more than 67,100 new COVID-19 infections daily, according to data from Johns Hopkins University. This represents a 25 percent increase from where numbers were last month.

Furthermore, hospitalizations have risen. As of Sunday, 44,000 COVID-19 patients were in US hospitals. This is an increase from the 37,900 from March.

Experts have cited several reasons for the rise in numbers, including the emergence of variants, pandemic fatigue, and increased travel.

"People are tired," Matthew Budd, the director of Personal & Preventative Health Services in Jackson County, Michigan, said. "We've been through all these lockdowns, we've been cooped up and ... now that it's getting warmer out people are saying 'You know, we're just tired, we want to be outside, we want to be around other people.'"

As more Americans continue to get vaccinated, hopefully, numbers will fall but the emergence of variants is intimidating.

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