There are more than 5 million known Covid-19 cases in the US, according to Johns Hopkins University.

One group that has seen a noticeable rise in US infections, children.

The report from the AAP and the CHA is expected to be revised weekly.

It's data comes from state health departments in 49 states, New York City, Washington DC, Puerto Rico and Guam.

Researchers say an effective testing strategy would help communities properly determine if and when to reopen schools for in-person teaching.

John Lorinc reports.