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2021 timeline: The ‘Year of COVID’ becomes the ‘Year of the Vaccine’

Review the major milestones associated with initial vaccine rollout, clinic scale-ups, and the race to determine the efficacy of vaccines on new variants


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In December 2020, after nearly a year of dealing with the devastation of COVID-19, the first vaccine was approved for emergency use, offering the world its first bit of hope for a light at the end of the pandemic tunnel.

From early discussions of who to prioritize with the initial rollout, to vaccine clinic scale-ups and the race to determine the efficacy of vaccines on new variants, 2021 was certainly the Year of the Vaccine.

Check out our interactive timeline to see the major vaccine milestones over the last 12 months.

Rachel Engel is an award-winning journalist and the senior editor of and In addition to her regular editing duties, Engel seeks to tell the heroic, human stories of first responders and the importance of their work. She earned her bachelor’s degree in communications from Cameron University in Lawton, Oklahoma, and began her career as a freelance writer, focusing on government and military issues. Engel joined Lexipol in 2015 and has since reported on issues related to public safety. Engel lives in Wichita, Kansas. She can be reached via email.