.. SinoVac COVID-19 Vaccine Has ‘0 To 40’ Antibody Levels Compared To Pfizer’s 1,300: Expert By Danielle Ong 08/31/21 AT 9:18 PM KEY POINTS A study in China found that SinoVac and SinoPharm were 70% effective in preventing COVID-19 infection A preprint … Continue reading A Chinese study of a Chinese province (Guangdong) shows the high efficacy of the Sinopharm Sinovac Covid-19 vaccine but a study in Brazil has found it only 54% effective…