Two doses of the Pfizer-BioNTech covid-19 vaccine provide more than 95% protection against infection, hospital admission, and death, including among older people, a peer reviewed study […]
The efficacy of different covid-19 vaccines against variants of concern, including those first identified in the UK and South Africa, will be assessed by Public Health […]
A Yale-led study reveals that new medicines and vaccines approved for use in the United States are often unavailable in countries that hosted their clinical trials, […]