A new Yale study provides important insights into breakthrough COVID-19 cases — instances where fully vaccinated individuals are infected by SARS-CoV-2 — and who is particularly vulnerable to serious illness.
In a study of hospitalized patients in the...
How nations can best allocate COVID-19 vaccines remains a discussion of global importance. And at its heart is the question of whether countries with greater access to vaccines should focus on vaccinating their own citizens or sharing their vaccine...