Coronavirus vaccine update: China's Zhifei starts Phase II trial of vaccine

Coronavirus vaccine latest update: Moderna, AstraZeneca, BioNTech, Novavax, Sinovac and CanSino Biologics are among those leading the fight against coornavirus. Catch latest updates on Covid vaccine

The total number of coronavirus cases across the world has crossed the 12-million mark and the death toll has gone past 550,000. There currently are over 100 vaccines at various stages of development worldwide, including in India, Britain, China, the US, Russia and Israel.

Coronavirus is finding new victims worldwide, giving rise to frightening clusters of infection that increasingly seems to confirm what many scientists have been saying for months: The virus might linger in the air indoors, infecting those nearby. If airborne transmission is a significant factor in the pandemic, especially in crowded spaces with poor ventilation, the