The big mystery regarding why COVID spares children still exists, but some emerging explanations suggest that children's innate immune systems respond faster, potentially reducing their risk of severe respiratory infections.

For the past two years, Bali Pulendran, a professor of microbiology, immunology, and pathology at Stanford University, has been investigating a riddle specific to COVID-19.

He previously stated, "The very young and the very old are the most vulnerable population...