The two use different platforms: Covishield is an adenovirus vector platform-based vaccine, while Covaxin is an inactivated whole virus vaccine. Worldwide, studies are under way to understand if a combination of two different vaccines can outperform two doses of the same vaccine. “While ICMR using a mistake to get some preliminary data on heterologous vaccination is commendable, there is no great novelty in the approach. Prior to Covid-19, studies have shown better and broader immune responses with mixing of vaccines of different types. “Even now there is very limited data,” Dr Bal said.

Source: Indian Express August 10, 2021 22:34 UTC