Recent research on the effectiveness of two doses of the Covid-19 vaccine showed that it provided sufficient protection against the spread of the deadly Delta variant worldwide, said Pharmaniaga vaccine specialist, Dr Ajit Pal Singh.

He said the research led by epidemiologist Zhong Nanshan of the Guangzhou Center for Disease Control and Prevention, using Sinovac Biotech’s CoronoVac and China National Biotec Group’s SARS-CoV-2 vaccines showed that they were more effective against those with moderate than mild Covid-19.

“The research found that two shots of the vaccines provided an efficacy of...