Pfizer claims 95% effective vaccine 18.11.2020 alex Science, technology and technology news Pfizer says its vaccine is 95 percent effective. In addition, the developer announced the availability of data on the safety of the drug, writes Mirror. Related posts: Seagate unveils RGB gaming external drives Seagate FireCuda Gaming Hard Drive review Pfizer claims third dose of vaccine against new strains is effective Scientists from the United States found that Moderna vaccine is more effective than Pfizer with delta strain