Can vaccinated people still spread COVID-19? How long does immunity last? Here’s what science knows now
Preschoolers with higher cardiorespiratory fitness do better on cognitive tests
18 February 2021The original antigenic sin: How childhood infections could shape pandemics
18 February 2021Can vaccinated people still spread COVID-19? How long does immunity last? Here’s what science knows now
Six times over the course of a year, some select COVID-19 vaccine recipients at the University of Pennsylvania are rolling up their sleeves for a different kind of needle: one that draws blood.
