oxford vaccine could be 59 % effective against asymptomatic infections , analysis shows
oxford vaccine could be 59 % effective against asymptomatic infections , analysis shows
the bmj the oxford and astrazeneca covid-19 vaccine prevented some asymptomatic covid-19 infections in phase iii trials, but the effect was mainly seen in the group who received a half dose first, followed by a full dose, the peer reviewed efficacy results have shown.1 the study, published in the lancet , found that vaccine efficacy against asymptomatic transmission was 59% in the group that received a half dose followed by a standard dose (seven cases among 1120 participants versus 17 cases among 1127 participants in the control group), but just 4% in the group that received two standard doses (22 among 2168 participants versus 23 among 2223 for the control).