Why are there so many different Covid-19 vaccines?

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Why are there so many different Covid-19 vaccines?
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SA vaccination sites administer the Pfizer vaccine and Johnson & Johnson vaccines.

The scale of the Covid-19 pandemic in 2020 led to pharmaceutical companies and medical research centres rushing to develop vaccines against the virus. File photo.There are several different Covid-19 vaccines available around the world, two of which are used in SA. explained why there are so many different vaccines on the market,

“There was also unprecedented government and private sector investment in vaccine development. There is now a wide range of technologies for developing new vaccines and many of the organisations developing Covid-19 vaccines have experience in one or more of these technologies.”

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