Tests at Chula vouch for efficacy of Sinovac, AstraZeneca vaccines

SUNDAY, MAY 09, 2021

The Sinovac and AstraZeneca vaccines are both helpful in stimulating peoples immunity against Covid-19, Dr Yong Poovorawan, a senior virologist at Chulalongkorn University, said on Sunday.

Citing a study by Chulalongkorn’s Centre of Excellence in Clinical Virology, he explained that people who got the first AstraZeneca jab had a 98.3 per cent immunity against Covid-19 compared to 99.4 per cent in people who had received the second Sinovac jab and 92.4 per cent in people who had been infected with Covid-19.

He also emphasised that people who had been infected with Covid-19 could get re-infected.

"We still do not know what level of immunity can prevent people from infection, but we already know that the severity of the disease would be reduced as long as we have immunity," he said.

He added that the centre is currently studying people's immunity against the Covid-19 in the long term.


"As Covid-19 has a short incubation period, it may be necessary to administer more doses to ensure people's immunity is at the highest level," he added.