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#viral vector

Europe's medicines watchdog has approved a Covid jab by Novavax, which uses a more conventional technology that the biotech firm hopes will reduce vaccine hesitancy. Photo: Justin Tallis / AFP
Europe's medicines watchdog has approved... [鈥

The technology behind Covid jabs

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
A vial of the Johnson & Johnson Janssen Covid-19 vaccine at a vaccination center in Chicago, Illinois, on March 5, 2021. Photo: Kamil Krzaczynski / AFP
A vial of the Johnson & Johnson Janssen ... [鈥

Clot questions over J&J and AstraZeneca vaccines

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: