Sinovac Vaccine Reportedly Poses Higher Chance Of Bell’s Palsy, Benefits Still Outweigh Risks: Study

Sinovac Vaccine Reportedly Causes Higher Risks Of Bell’s Palsy

Earlier, we had reported the Health Science Authority’s (HSA) findings regarding extremely low rates of adverse events among individuals who have received their Covid-19 vaccine jabs in Singapore.

389 Cases Of Serious Vaccine Effects Reported In S’pore, Most Respond Well To Treatment

Interestingly, a study featured in the prestigious Lancet journal found that Sinovac vaccine recipients have a higher chance of developing Bell’s Palsy.


Despite this, the researchers concluded that the protective benefits the Sinovac vaccine provides still outweigh the risks.

0.006% of 451,000 Sinovac recipients develop Bell’s Palsy

According to a study posted in The Lancet journal on 16 Aug, 28 individuals developed Bell’s Palsy after receiving the Sinovac vaccine.


For the unacquainted, Bell’s Palsy is a type of facial muscle weakness reportedly caused by inflammation of the facial nerve.

This accounts for just 0.006% of the 451,939 individuals who received the China-made vaccine and were part of the study.

Though this represents an extremely low proportion of the recipients, it’s still significantly higher than that seen in individuals who received the Pfizer-BioNTech vaccine.

Of the 537,205 people who got the mRNA vaccine, just 16 or 0.003% developed Bell’s Palsy.


The onset of the facial paralysis condition occurred within 42 days of the vaccination. The mechanism through which the Sinovac vaccine causes Bell’s Palsy, however, remains unclear.

Despite the reportedly increased risk of Bell’s Palsy, the researchers concluded that the benefits of the vaccine “far outweigh” the risks.

Sinovac spokesperson says most symptoms are mild

Responding to the findings, a Sinovac spokesperson said that it’s rare for individuals to develop Bell’s Palsy after vaccination.

Reuters also reported the company’s statement that they have not detected any risk of Bell’s Palsy in its analysis of medical data from various sources.

The spokesperson added that most symptoms were mild and patients got better on their own.

47 adverse events from Sinovac vaccine reported in Singapore

Here in Singapore, HSA has received 47 reports of adverse events associated with the Sinovac vaccine since 2 Jun.

This accounts for just 0.03% of the 149,107 doses administered to date.

It remains unclear how many of these are serious or involve Bell’s Palsy.

Risks are still extremely low

Though the reportedly high risk of Bell’s Palsy may cause some to think twice about taking the Sinovac vaccine, it’s noteworthy that the numbers are extremely low at just 0.006%.

To put that into perspective, one is about 2x as likely to strike 4D.

We hope those who remain unvaccinated will go ahead and get their jabs soon to protect themselves and those around them.

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Featured image adapted from Sinovac on Weibo

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