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AstraZeneca and Oxford scientist say their COVID-19 Vaccine is up to 90% effective Source: Oxford University AstraZeneca and Oxford scientist say their COVID-19 Vaccine is up to 90% effective. They want to produce 200 million doses by the end of the year. And 3 billion doses globally by the end of 2021.  In trials, the vaccine prevented COVID-19 symptoms in 70% of participants. This grew to 90 %, in those given a smaller initial dose. Which scientists think might encourage a stronger immune system response. Smaller dose would also mean more people could be treated with existing supplies. Source: Oxford University AstraZeneca has pledged not to receive profit from the Covid-19’s vaccine. Selling it for no more than it costs of produce, while the pandemic continues, and indefinitely in developing countries. One of the most important thing is AstraZeneca have already produce 2 other vaccine and also promising results.  Source: Oxford University Both Moderna, and Pfizer with par...