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View Astrazeneca Vaccine Efficacy Rate Images . There have been a number of questions about this candidate and its effects in the clinic, so the. 'the astrazeneca vaccine is the least effective of the three vaccines that have had randomised controlled clinical trials published. AstraZeneca, Oxford COVID-19 vaccine 70 percent effective ... from homelandprepnews.com Flu vaccines, which differ each year depending on the flu strain in circulation, are typically 54 to 64 effective against seasonal influenza, sharma said. Cnbc's meg tirrell reports on vaccine distribution and news out of astrazeneca regarding its own vaccine trial. Astrazeneca's vaccine has a number of advantages over other leading vaccine candidates: Who else can take the vaccine? Astrazeneca's efficacy rate, however, was more complicated. The astrazeneca/oxford vaccine showed a somewhat lower efficacy, ...