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Adrian James, 2, who tested positive for the coronavirus disease (COVID-19), breathes with the help of a ventilator at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

Adrian James, 2, who tested positive for the coronavirus disease (COVID-19) and is on a ventilator, receives treatment at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

A healthcare worker removes mucous from the nose of a patient who is being treated for the coronavirus disease (COVID-19), at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

Tiffany Jackson comforts her son Adrian James, 2, who tested positive for the coronavirus disease (COVID-19), as he breathes with assistance from a ventilator at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

Healthcare workers treat pediatric patients for the coronavirus disease (COVID-19) at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

A respiratory therapist checks on Adrian James, 2, who tested positive for the coronavirus disease (COVID-19) and is on a ventilator, at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

Doctors discuss the treatment of Adrian James, 2, who tested positive for the coronavirus disease (COVID-19), at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

Nicole Thompson feeds her son Wilder, who is being treated for the coronavirus disease (COVID-19), at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

Nicole Thompson holds her son Wilder, who is being treated for the coronavirus disease (COVID-19), at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

Tiffany Jackson comforts her son Adrian James, 2, who tested positive for the coronavirus disease (COVID-19), as he breathes with assistance from a ventilator at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

Nicole Thompson holds her son Wilder, who is being treated for the coronavirus disease (COVID-19), at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

Nicole Thompson holds her son Wilder, who is being treated for the coronavirus disease (COVID-19), at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

A healthcare worker responds to a page as a patient who tested positive for the coronavirus disease (COVID-19) receives treatment at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.

Healthcare workers treat pediatric patients for the coronavirus disease (COVID-19) at SSM Health Cardinal Glennon Children's Hospital in St. Louis, Missouri, U.S., October 5, 2021.