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New data out this week shows that more than 500,000 children in the U.S. have tested positive for the coronavirus since the pandemic began, according to the American Academy of Pediatrics 

(AAP). The group said children represented 9.8% of all COVID-19 cases in the U.S., where more than 6.3 million total cases have been reported, per a tally by Johns Hopkins University. The 

AAP reported there were 70,630 new child cases, a 16% increase over two weeks, between August 20 and September 3, which brings the national total to 513,415. Puerto Rico was among six states

and territories that showed an increase in child cases. The AAP and the Children's Hospital Association compiled the data of children of varying ages as reported by 49 state health

departments, New York City, Puerto Rico and Guam. Texas was excluded from the analysis, the AAP noted. CORONAVIRUS DEATHS AMONG CHILDREN The report said the cumulative death toll in the U.S.

for children due to the coronavirus is 103. In a subset of data that was analyzed from 42 states and New York City, children were 0-0.3% of all COVID-19 deaths, and 18 states reported zero

child deaths. "At this time, it appears that severe illness due to COVID-19 is rare among children," the AAP said. But health experts have said that kids can spread COVID-19.

Meanwhile, the Centers for Disease Control has issued new data about a deadly and mysterious pediatric illness with apparent links to the coronavirus. Since mid-May, the CDC has been

following an outbreak of Multisystem Inflammatory Illness in Children (MIS-C), which is also or sometimes referred to as PMIS. The CDC describes it as "a rare but serious condition

associated with COVID-19" that sometimes presents after a COVID illness or after contact with someone with COVID-19. Instead of attacking the lungs like the new coronavirus disease does

in adults, this syndrome, while seemingly very rare, can trigger serious, even deadly cardiac complications in kids. As of September 3, the CDC has collected reports of 792 confirmed cases

of MIS-C and 16 deaths across 42 states, New York City and Washington, D.C. Other cases are under investigation. The CDC's data suggests that "most cases are in children between

the ages of 1 and 14 years, with an average age of 8 years." They also note that "more than 70% of reported cases have occurred in children who are Hispanic/Latino (276 cases) or

Non-Hispanic Black (230 cases)." SOME STUDENTS RETURNING TO IN-PERSON CLASSES The AAP report was released as thousands of children returned to school this week for in-person classes. On

Long Island, parents seemed nervous and excited as they dropped their children off. Students lined up in Richardson, Texas, for temperature checks before entering the building. Forrester

Elementary in San Antonio is usually packed with 850 kids; but this morning, only 53 opted for in-person classes. "I feel like they're just a little off balance, maybe a little bit

with the rooms looking different, everybody wearing masks," principal Kelly Mantle told CBS News. "I think it is going to become a new norm for a little while and children are

going to get used to it and we're getting used to it every day that goes by." The new figures from the AAP have some educators worried, like those in suburban Phoenix, where the

first day of in-person classes was canceled after teachers called in sick. In New York, new cases are up more than 25% compared to two weeks ago. And with New York City schools preparing for

in-person classes in the coming weeks, Governor Andrew Cuomo is trying to quell parents' fears. "We're going to have a COVID report card for every school in the state,"

he said. _Omar Villafranca contributed to this report._ CORONAVIRUS PANDEMIC MORE Peter Martinez Peter is a Product Manager for the content management system that powers CBSNews.com.

He's a former News and Homepage Editor who helped cover a variety of stories from breaking news to award shows. Peter joined CBS News Digital in February 2017. He previously worked at

ABC News and AOL.com. Contact him at [email protected]