![]() ![]() But unlike the Pfizer-BioNTech and Moderna vaccines, which store the instructions in. Sources: National Center for Biotechnology Information Nature Florian Krammer, Icahn School of Medicine at Mount Sinai. The Oxford-AstraZeneca vaccine is based on the virus’s genetic instructions for building the spike protein. May 7 Pfizer and BioNTech apply for full approval from the U.S. 26 The companies announce a study to develop a B.1.351-specific booster.Īpril 16 Pfizer says their vaccine may require a third dose within a year of the initial inoculation, followed by annual vaccinations.Īpril 20 Some vaccinated people are professing loyalty to the brand they happened to have received.Īpril 25 Nearly 8 percent of Americans who got initial Pfizer or Moderna shots have missed their second doses.Īpril 28 Pfizer has delivered more than 150 million doses of the vaccine to the United States, and expects to double that number by mid-July. 15 Pfizer and BioNTech register a trial specifically for pregnant women.įeb. However, researchers find that antibodies produced by Comirnaty are somewhat less effective against another variant called B.1.351, first identified in South Africa.įeb. Tests on a variant called P.1, first identified in Brazil, show that Comirnaty will likely work against it as well. January, 2021 Scientists grow concerned about the emergence of fast-spreading variants that might be able to evade antibodies. Each vaccinated person will require two doses. 31 Pfizer expects to produce up to 50 million doses by the end of the year, and up to 1.3 billion doses in 2021. 21The European Union authorizes the vaccine.ĭec. 14 Vaccination begins in the United States.ĭec. Mexico also approves the vaccine for emergency use.ĭec. Like the Pfizer vaccine, Modernas vaccine is based on the viruss genetic instructions for building the spike protein. grants Pfizer-BioNTech vaccine the first emergency use authorization for a coronavirus vaccine in the United States. See the discussion in on the development of the Moderna vaccine, and the same applies to all. That's how it sits in the virus itself, and it does the same in human cells. ![]() ![]() 10 Saudi Arabia approves the vaccine.ĭec. The Spike protein is not released to wander freely through the bloodstream by itself, because it has a transmembrane anchor region that (as the name implies) leaves it stuck. 9 Canada authorizes the Pfizer-BioNTech vaccine.ĭec. 8 William Shakespeare, age 81, is among the first people to receive a shot of the vaccine in Britain, on the first day of vaccinations for at-risk health care workers and people over 80.ĭec. 2 Britain gives emergency authorization to Pfizer and BioNTech’s vaccine, becoming the first Western country to give such an approval to a coronavirus vaccine.ĭec. 20 Pfizer requests an emergency use authorization from the F.D.A.ĭec. The final data from the trial shows the efficacy rate is 95 percent. 9 Preliminary data indicates the Pfizer vaccine is over 90 percent effective, with no serious side effects. ![]()
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