Quote Originally Posted by sihnfahl View Post
And the Brazilian CoronaVac trial has come back with its finalized results:

"There were 253 confirmed COVID-19 cases in the cohort: 85 cases (11.0/100 person-year) among 4,953 participants in the vaccine group, and 168 cases (22·3/100 person-year) among 4,870 participants in the placebo group. The primary efficacy against symptomatic COVID-19 was 50·7% (95%CI 36·0-62·0). The secondary efficacy against cases requiring assistance (score ≥3) and moderate and severe cases (score ≥4) were 83·7% (95%CI 58·0-93.7) and 100% (95%CI 56·4-100.0) respectively."
Those confidence intervals look huge, though they seem to be in line with those from the Astra-Zeneca trials using a 12-week dosing interval (82.4% efficacy with 95% CI from 62.7%-91.7%)*. I can't find the confidence interval for the AZ vaccine in how well it prevents severe symptoms and death, which is pretty disappointing since they have been touting 100% effectiveness.

*Note: These numbers seem to be off from other reports since it is only for Symptomatic cases of Covid-19. The efficacy drops somewhat when asymptomatic cases are included.