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How do the different vaccines work against Covid-19? The WHO has authorised the use of Novavax's Nuvaxovid, a subunit vaccine that contains a purified piece of the virus to trigger an immune response
The European Medicines Agency (EMA) says blood clots should be listed as a "very rare" side effect of the Johnson & Johnson COVID vaccine. What we know about the jab and similar AstraZeneca shot: