China COVID Vaccine Reports Mixed Results–What Does That Mean for the Pandemic?

January 15, 2021

(Nature) – Long-awaited results about the effectiveness of a leading Chinese COVID-19 vaccine were tinged with disappointment and confusion this week. But researchers say the vaccine could help reduce deaths from the disease. Researchers in Brazil reported that CoronaVac, developed by Beijing-based Sinovac, was 50.4% effective at preventing severe and mild COVID-19 in late-stage trials. That’s significantly lower than the 90% efficacies of several leading vaccines. The CoronaVac figures were much lower than those from early trials of the same vaccine in Turkey and Indonesia, and below the efficacy first reported by the Brazil trial team last week.