Covid vaccines: what is patent waiving and will it solve the global shortage?

Analysis: US now supports waivers, but experts say on its own it will not have a decisive impact on vaccine inequality

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For those advocating for greater access to vaccines, it is a case of two cheers for Joe Biden. His administration's decision to support a push at the World Trade Organization (WTO) to waive patents on Covid-19 vaccines may be a huge step towards ending vaccine inequity, campaigners say, but on its own it will not have a decisive effect on the health crisis.