AstraZeneca releases positive Phase 2 COVID-19 vaccine data, says Phase 3 data available by Christmas

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Pharmaceutical company AstraZeneca on Thursday released data showing positive results from its Phase II COVID-19 vaccine trial, particularly among adults over 56 years old.

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Laboratory technicians work at the mAbxience biopharmaceutical company on an experimental coronavirus vaccine developed by Oxford University and the laboratory AstraZeneca in Garin, Argentina. (AP Photo/Natacha Pisarenko, File)

"The reason that we’re so delighted is that we’re seeing the immune responses look exactly the same, even in those who are over 70 years of age," Oxford Professor of Pediatric Infection and Immunity Dr. Andrew Pollard, told the BBC.

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Adverse effects of the vaccine were limited and mild, and fewer adverse effects were recorded after a boost vaccine.

Phase II vaccine trials provide important preliminary data but don’t prove whether they ultimately prevent people from getting sick. Oxford and AstraZeneca are waiting for the results of Phase III trials on thousands of people around the world to show whether their vaccine is safe and effective.

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Two other drugmakers, Pfizer and Moderna, this week reported preliminary results from late-stage trials showing that their COVID-19 vaccines were almost 95% effective.

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The Associated Press contributed to this report.

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