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Is 12 weeks between Covid jabs too long?

Is 12 weeks between Covid jabs too long? David Spiegelhalter and Anthony Masters © Provided by The Guardian Photograph: Murdo MacLeod/The Observer The UK has a controversial policy of giving second doses of coronavirus vaccine 12 weeks after the first dose, rather than the three-week gap used in other countries. What is the reasoning behind what the First, since there are limited doses of vaccine, this strategy means protecting more people, faster. This is an optimisation problem against supply constraints, time and a deadly virus. Modelling showed that, provided the first dose delivered reasonable efficacy, then most lives would be saved by lengthening the gap. By 17 February, there had been about 17 million vaccinations in the UK, with more than 16 million people having had a first dose. If a three-week gap had been used, only about 10 million would have had any vaccine.

Israeli study points to huge drop in symptomatic Covid-19 infections among people who received two doses of Pfizer jab

Israeli study points to huge drop in symptomatic Covid-19 infections among people who received two doses of Pfizer jab Michael Howie A new study in Israel has reported a 94 per cent drop in symptomatic Covid-19 infections among people who received two doses of the Pfizer vaccine. The study, the biggest of its kind in the country to date, found that the same group was also 92 per cent less likely to develop severe illness from the virus. The research was carried out by the health maintenance organisation Clalit, which covers more than half of all Israelis. It compared 600,000 people who received two doses of the vaccine against a group of the same size, with matching medical histories, who had not received the jab.

People who ve had COVID only need one vaccine shot, say French experts

People who ve had COVID only need one vaccine shot, say French experts France s top health authority has recommended that people who ve had coronavirus only get one vaccine dose. © N/A A nurse prepares doses of the Moderna vaccine at a centre in Le Cannet, southern France Those who have recovered from the virus have built an immune response similar to that brought on by a vaccine, said the High Authority of Health (HAS). It said a single shot would play the role of reminding the person s body how to fight the infection. The vaccines approved by the European Union - made by Moderna, Pfizer and AstraZeneca - all stipulate two doses with a gap inbetween to achieve maximum protection.

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