HONG KONG – Following a wave of concern about the efficacy of two COVID-19 vaccine candidates developed by China National Pharmaceutical Group (Sinopharm), interim analysis of an ongoing phase III trial, published May 26 in the Journal of the American Medical Association, has shown that adults receiving at least one dose of either of the company’s two inactivated SARS-CoV-2 vaccines had significantly reduced the risk of symptomatic COVID-19.