Two COVID-19 vaccines developed by China's Sinopharm have shown an efficacy of over 72 percent in large scale phase-3 clinical trials, according to a study published in The Journal of the American Medical Association (JAMA) on May 26.

The two inactivated vaccines, developed by Sinopharm's Wuhan Institute of Biological Products and Beijing Institute of Biological Products, showed an efficacy of 72.8 percent and 78.1 percent respectively against symptomatic COVID-19 cases, with rare serious adverse effects reported and it is the world's first published phase-3 study results of inactivated COVID-19 vaccines.