A virus has brought the world’s most powerful country to its knees.
Scientists welcome the first compelling evidence that vaccines can prevent COVID-19 – but questions remain about how much protection they offer, and for how long.
Different SARS-CoV-2 strains haven’t yet had a major impact on the course of the pandemic, but they might in future.
If approval comes before clinical trials end, this could complicate the study of vaccines’ long-term effects
Bill Gates and Rashida Jones Ask Big Questions Podcast
The US has never had enough coronavirus tests. Now a group of epidemiologists, economists and dreamers is plotting a new strategy to defeat the virus, even before a vaccine is found.
Since 2016, yellow fever outbreaks have become a major public health concern