Since the beginning of the Covid-19 pandemic, scientists around the world have struggled to determine the origin of the coronavirus that caused it. Linfa Wang knows...
Healthy, young volunteers who have previously been infected with COVID-19 are deliberately exposed to a second coronavirus to see how the immune system responds as part...
The Covid-19 pandemic gave a powerful punch to preventive care, delaying everything from cancer screening to tooth cleaning. Even if the clinic is reopened, limited time...
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