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COVID-19 vaccine timeline

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Learn about the timeline of the COVID-19 vaccine and if you are up to date with your COVID-19 vaccine. 

The COVID-19 vaccine first became available in December 2020, but it has changed over time to better fight different versions of the virus. The COVID-19 vaccine can help protect you from becoming seriously ill or dying from the virus.  

This fact sheet answers common questions about how the COVID-19 vaccine has changed over time, including: 

  • When did the COVID-19 vaccine become available? 
  • What is the difference between the original, bivalent, and updated vaccines? 
  • Are you “up to date” with your COVID-19 vaccine? 
COVID-19 vaccine timeline
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