WASHINGTON, United States (AFP) — The Pfizer Covid-19 vaccine has proven 94 percent effective in a study involving 1.2 million people in Israel, the first peer-reviewed real world research confirming the power of mass immunization campaigns to bring the pandemic to a close. The paper, which was published in the New England Journal of Medicine on Wednesday, also demonstrated there is likely a strong protective benefit against infection, a crucial element in breaking onward transmission. […]