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A COVID-19 vaccine is any of the vaccines used against COVID-19 (a disease caused by the SARS-CoV-2 virus). In July 2020, more than 150 vaccines were being developed in different laboratories.[1] Two mRNA vaccines, one by Pfizer and one by Moderna, were approved late in 2020. Both are over 90% effective.[2] A few vaccines also went into use in early 2021.
Several countries planned to give the vaccine to many people, but their plans were different. The United Kingdom used its National Health Service. Canada used its military. The United States sent vaccines to all fifty states and the state governments each made their own system.[3]
The United Kingdom approved the Pfizer vaccine before the European Union or United States did. They began giving it to people on December 8, 2020.[4] The United States began giving people the vaccine on December 14, starting with health care workers in New York City.[5] By April 2021, several vaccines were in use around the world and hundreds of millions of people had been vaccinated.
Covid vaccination started for children aged 12-14 in India on 16 March 2022 [6]
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