Study shows Sinovac effective against Delta


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

He said the research led by epidemiologist Zhong Nanshan of the Guangzhou Centre 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 59% against Covid-19 caused by the Delta variant, 70.2% against a moderate form of the disease and 100% against severe cases.

“In this regard, the research also exceeded the threshold decided by the World Health Organisation to reach the standard that any vaccine for SARS-CoV-2 must achieve the efficacy of 50%,” he said in an article released to Bernama yesterday.

The Public Health expert said the research polled data from 628 participants, including 153 Covid-19 patients of the Delta variant and 475 close contact cases in Kuala Lumpur, aged between 18 years and 59 years.

Out of those cases caused by the Delta variant, 10 had critical symptoms, severe (six), moderate (105) and mild (32).

Meanwhile, the research also revealed that a single vaccine dose showed some degree of protection against Covid-19 with an effectiveness of 13.8% and that none of the 16 critical and severe cases had been vaccinated with the SARS-CoV-2 vaccine.

“In the same research, the scientists also discovered that the vaccine effectiveness was higher in females and people in the age group of 40-59, with an efficacy rate of 72.5%, compared to males and those with moderate Covid-19,” said Dr Ajit.