Of two new studies on severe COVID-19 in children, the first finds that more than one in four had an underlying medical condition, and the second shows that kids diagnosed as having acute lower respiratory tract infection (ALRI) were over twice as likely to require invasive mechanical ventilation.Type 1 diabetes, obesity, heart problemsIn the first study, published today in JAMA Network Open, researchers from the US Centers for Disease Control and Prevention used the Premier Healthcare Database Special COVID-19 Release, which houses data from 872 hospitals, to study 43,465 patients 18 and younger who visited an emergency department or were hospitalized for severe COVID-19 from March 2020 to January 2021.They found that 28.7% of all COVID-19