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Pfizer-BioNTech vaccine: the two injections must be given 21 days apart. Photograph: Liam McBurney/PA Wire

The Pfizer/BioNTech vaccine may be less effective in people with obesity, data suggests. Italian researchers have discovered that healthcare workers (...)

US president Joe Biden speaks during an event commemorating the 50 millionth Covid-19 vaccine shot in the US on Thursday. Photograph: Doug Mills/The New York Times/Bloomberg

The US government on Saturday authorised Johnson & Johnson’s single-dose Covid-19 vaccine, enabling millions more Americans to be vaccinated in th(...)

Marie Nangle, a GP from Tullamore, receives her second dose of the Moderna vaccine from Kayte Gamble, a GP registrar, at the GP vaccination clinic in the Midlands Park Hotel, Portlaoise. Photograph: Brian Lawless/PA Wire

We’re living in dangerous, nerve-racking times. Every indicator, from daily Covid-19 case numbers to hospital admissions and deaths, tells us that whi(...)

The EU’s advance purchase deal with J&J allows member states to purchase vaccines for 200 million people. Photograph:  Emmanuel Croset/AFP  via Getty

A panel of expert advisers to the US Food and Drug Administration on Friday voted to recommend authorisation of Johnson & Johnson’s one-dose Covid(...)

A health worker prepares a dose of the Pfizer-BioNTech Covid-19 vaccine. Photograph: Wael Hamzeh/EPA

The first big real-world study of the Pfizer/BioNTech vaccine to be independently reviewed shows the shot is highly effective at preventing Covid-19, (...)

At work  in the future mRNA production site of CureVac’s Covid vaccine CVnCoV at a Bayer plant  in Wuppertal, Germany. Photograph: EPA

Fifteen years ago, after an hour-long meeting in the basement of a Paris hotel, Bill Gates agreed to back a German entrepreneur who claimed a new clas(...)

Many patients with serious underlying health conditions are to be vaccinated earlier against Covid-19. File photograph: Dara Mac Dónaill/The Irish Times

Many patients with serious underlying health conditions are to be vaccinated earlier against Covid-19, under a change to the Government’s vaccine allo(...)

Paramedic Andrew Parker prepares a vaccine inside a holiday coach  near Inverness, Scotland, which is being used  as a mobile coronavirus vaccination centre. Photograph: Andrew Milligan/PA Wire

Vaccination led to a massive reduction in the risk of Covid-19 patients who had received one dose needing to be hospitalised in Scotland, according to(...)

Holders of the required “green pass” – proof of being fully vaccinated against the coronavirus – enter a pool and gym facility in  Tel Aviv, Israel, on Sunday. Photograph: Gil Cohen-Magen/AFP via Getty Images

The Covid-19 vaccine made by BioNTech and Pfizer has been highly effective at preventing infection in Israel, according to the first real-world data s(...)

Children wear face masks in class in a Junior School in Jerusalem. Israel reopened schools, almost two months after they were closed due to the coronavirus pandemic. Photograph: Abir Sultan/EPA

Israel lifted many of its coronavirus restrictions and started reopening its economy on Sunday as the country’s vaccination drive and third nationwide(...)

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