A peer-reviewed study, published in the Nature journal, investigated brain changes in 785 participants aged 51–81 whose brains were scanned twice, including 401 people who caught Covid between their two scans.
The yet to be published study comes as vaccine makers warn the world will need yearly booster shots or new vaccine to tackle variants, although some scientists question if such shots are necessary.
Health officials conducting a trial involving 32,000 volunteers found the Covid-19 vaccine by Oxford University and AstraZeneca has 79 percent efficacy in preventing symptomatic illness with no increased risk of blood clots.
Nobel Peace Prize winner Malala Yousafzai takes her love for television and film to the small screen as she partners up with Apple TV+.
South Africa received one million AstraZeneca doses last week and had hoped to start vaccinating health workers soon but results that are yet to be peer-reviewed show minimal protection against mild or moderate infection from the B.1.351 variant.
Trial data from University of Oxford and AstraZeneca’s Covid-19 vaccine shows it offers similar efficacy against original virus and its more easily transmissible variant circulating in the UK.
Satellite images can help save elephants, especially the ones that are decreasing in number in Africa, a new study says.
The tough three-tier system of restrictions that will now be in place has been criticised as doing little to reinstate cherished freedoms or help the virus-battered economy
Scientists are racing to find a cure for Covid-19. These are some of the leading vaccines making waves.
University of Oxford and AstraZeneca say they will have 200 million vaccine doses ready by end of 2020, with drug substance for 700 million doses by end of first quarter of 2021 globally.
The experimental drug, developed by the US National Institutes of Health and Moderna, will be tried on 30,000 volunteers in the US who won't know if they're getting the real shot or a placebo in order to see which group experiences more infections.
Britain has said it was the first such deal which Pfizer and BioNTech had agreed for the supply of their vaccine, which is being tested in early to mid-stage trials.
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