The World Health Organization is in contact with two major Chinese vaccine developers in the hope they will share the patents for their Covid-19 jabs.The WHO has repeatedly called for sharing Covid-19 vaccine patents to increase supplies and ensure equitable access for developing countries.But so far it has had the cold shoulder from pharmaceutical giants – including Pfizer, Moderna, Johnson & Johnson and AstraZeneca – even though it has set up a mRNA technology transfer hub in Africa,…

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