Pfizer and BioNTech announced Monday their coronavirus vaccine was more than 90% effective in preventing COVID-19 among those without evidence of prior infection, hailing the development as “a great ...

A third dose of the Pfizer/BioNTech COVID-19 vaccine can "strongly" boost protection against the delta variant -- beyond the protection afforded by the standard two doses, suggests new data released ...

President Donald Trump has demanded that pharmaceutical companies such as Pfizer release what he described as hidden COVID-19 vaccine data, raising questions about the legacy of Operation Warp Speed, ...

Pfizer and BioNTech said Monday that late-stage trials of its COVID-19 vaccine in children show that the shots were safe and effective in kids aged between 5 and 11. The results mark a key step in ...