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Spread of Covid-19 variants heightens debate over extra vaccines

A growing number of countries are considering third vaccine shots, but it is still not clear that this is the most effective way to tackle Covid-19 as new variants spread and it remains unknown how long their protection lasts.Scientists say this is a complicated question and the answers could vary according to individual or national circumstances – or the vaccines involved.The World Health Organization says so far there is no evidence booster shots are needed.“Currently, data shows us that…

Read the original article at South China Morning Post

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