Oxford-AstraZeneca's COVID-19 vaccine has average effectiveness of 70%
                                
                                
                                    (Newser) -
                                    Another COVID-19 vaccine trial is reporting positive news: The vaccine developed by British pharmaceutical company AstraZeneca in collaboration with the University of Oxford is "highly effective" at preventing disease, the pharma giant says in a statement. The vaccine was found to have an average effectiveness of 70%,  CNBC  reports,...