Amid rising Covid-19 cases and hospitalizations, local US leaders and public health experts worry of a coming surge - CNN

In Colorado, Denver Mayor Michael Hancock said Covid-19 cases are rising at a "concerning rate," while the city's seven-day average daily case rates are as "high right now as they were at the height of the pandemic back in May."

The seven-day average of hospitalizations also rose about 37% in a little more than a week, he said during a Monday news conference, and warned residents could soon see tighter Covid-19 restrictions if the city's numbers continue to trend in the wrong direction.

In Wisconsin, a field hospital is opening this week in response to a surge of Covid-19 patients -- days after the state reported record-high numbers of Covid-19 cases, hospitalizations and daily deaths.

As emergency physicians begin to see an uptick in severe Covid-19 cases, they're also growing fearful another surge is on its way, Dr.

Megan Ranney, an emergency medicine physician with Brown University, said Saturday.

"We are all seeing increasing numbers of Covid-19 patients who are coming into our ERs, who are getting really sick, requiring hospitalization and even intensive care," Ranney told CNN.

13% increase in child Covid-19 cases in 2 weeks

Meanwhile, more children are also being diagnosed with the virus, an updated report from the American Academy of Pediatrics and the Children's Hospital Association shows.

The report found a 13% increase in child cases reported from September 24 to October 8 -- with more than 77,000 new reported infections.

Children represented about 10.7% of Covid-19 cases in the states that reported cases by age, the report said.