Several new tests look for SARS-CoV-2 in saliva, and the new work finds a striking correlation between high virus levels and later hospitalization or death.
After a discontinued first attempt, WHO heads back to China to continue its investigative mission to study the COVID-19 pandemic's origins.
The United Kingdom decided to allow up to 12 weeks between doses of two authorized vaccines, rather than the 3 or 4 weeks tested in trials.
Two gorillas at the San Diego Zoo Safari Park test positive for the coronavirus that causes COVID-19.
When analyzed by stricter criteria than used earlier, the vaccine’s efficacy against all forms of COVID-19, including mild cases, dropped from about 78% to 50%.
Brazil is inching closer to having an authorized COVID-19 vaccine called CoronaVac, created by the Chinese company Sinovac.
"This needs to be a science-driven response," said Luciana Borio, who is on President-elect Joe Biden’s transition team.
As the COVID-19 pandemic surges, fueled in some places by new, fast-spreading variants, officials and public health experts are debating strategies for stretching limited supplies of vaccines. And vaccinemakers have been caught in the middle.
In southeastern England, the new variant of COVID-19 identified last month may be the harbinger of a new, particularly perilous phase of the pandemic.
Over the course of the pandemic, Edwine Barasa has worked with epidemiologists to reveal the surprisingly small impact of the disease in Kenya—so far.
Statements about vaccines in China and the United Kingdom have caused perplexity.
Novavax plans to apply for European regulatory approval for its vaccine candidate.