Vaccines against Covid-19 were developed on the basis of protein S, before it had the mutations identified in these variants. Although research conducted so far is less effective against variants and continues to offer protection against severe forms of Covid-19, further research is ongoing. WHO is working with every country in the world to help coordinate the key stages of this vaccine manufacturing and development process. In particular, to facilitate equitable access for all countries to

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... ines against Covid-19 and that they are safe and effective for the billions of people who need them.