Taking Sinovac Vaccine Without Booster Shot Might Cause Severe COVID Diseases

The Sinovac vaccine was shown to be 60% effective against serious disease, compared to 90% for the Pfizer vaccine and 97% for Moderna's.


Taking Sinovac Vaccine Without Booster Shot Might Cause Severe COVID Diseases

A recent local study found that those who received two doses of China's Sinovac vaccines were more likely to get the serious illness from Covid-19 than those who received two doses of the mRNA-based Pfizer-BioNTech or Moderna vaccines.

This supports the need for three doses of Sinovac-CoronaVac vaccine as a primary series," the National Center for Infectious Diseases (NCID) and the Ministry of Health issued a joint statement on Wednesday (Dec 15).

The Sinovac vaccine was shown to be 60% effective against serious disease, compared to 90% for the Pfizer vaccine and 97% for Moderna's.

In other words, those who received the Sinovac vaccination were more likely to require supporting oxygen and intensive care, as well as to die from coronavirus infection.

Source - CNA

Between October 1 and November 21, a survey of 1.25 million individuals aged 40 and over indicated that 73.7 percent had received the Pfizer vaccination, whereas another 23.9 percent had received the Moderna vaccine. The remaining 2.4 percent had received the Sinovac vaccine.

Eventually, 62,900 people got infected with Covid-19, and 1,710 developed severe illnesses.

The studies concentrated on the Delta variant – the most prevalent strain in Singapore – and took into consideration differences in age, gender, ethnicity, housing type, and daily infection rates.

The authorities recommended that those who have already had two doses of the Sinovac vaccine get a third dose of either the Pfizer or Moderna vaccine as part of their main vaccination series. Otherwise, they should receive a third Sinovac dose.

It said that international data validated its results.

According to preliminary data from Chile, those who had two doses of the Sinovac shot and subsequently the Pfizer vaccine as a third dose saw a 95% decrease in their chance of infection.

In comparison, the risk decrease was 71% in those who took Sinovac as their third dose.

Additionally, the elevation in antibodies was 27 times greater in the first group than in the second group.

We will continue to monitor the vaccine effectiveness of the mRNA and non-mRNA vaccines, including how they are enhanced by a third dose or a booster dose," the authorities said. “In the meantime, all persons who are eligible for their boosters should get boosted when it is offered to them.

Source – The Straits Times

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