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Sinovac or Pfizer vaccines equally effective against Covid-19 infection

The Malaysian government’s temporary halting of the Sinovac vaccine roll out has been incorrectly reported as reflecting its lack of confidence in Sinovac efficacy.  Nothing is further from the truth.

There is very good published medical data on the actual effectiveness of Sinovac used in the real world setting. On 7 July, the New England Journal of Medicine published a report on the Sinovac experience in Chile from Feb to May 2021 looking at 4.2 million fully vaccinated people compared to 5.5 million unvaccinated residents. Sinovac was found to reduce Covid-19 infection by  65.9% , reduce hospitalization by 87.5%,, reduce ICU admission by 90.3% and reduce deaths by 86.3% (Effectiveness of an Inactivated SARS-CoV-2 Vaccine in Chile. New England Journal Medicine July 7, 2021 DOI: 10.1056/NEJMoa2107715. Available at: [LINK]. In contrast to this article from Chile that had 218,784 Covid-19 cases, the Pfizer trial that reported an efficacy of 95% was very small and analyzed only 170 Covid-19 cases (8 in vaccinated, 162 in unvaccinated group) [Safety and Efficacy of the BNT162b2 mRNA Covid-19 Vaccine. [. The Isreal Ministry of Health has also pointed out recently that the effectiveness of the Pfizer vaccine against Covid-19 infection was 64%, although it was still 93% effective against hospitalization and serious illness (Israel sees drop in Pfizer vaccine protection against infections, still strong in severe illness. Available at: [LINK]. Therefore there is not much difference between the Sinovac and Pfizer vaccines in actual practical use. Both are very effective at preventing severe disease and hospitalization, but less effective against mild or asymptomatic Covid-19.

The Malaysian government’s temporary suspension of Sinovac use has nothing to do with vaccine efficacy but is a matter of logistics. After ordering and receiving 32 million doses of Sinovac, almost 16 million doses have been given, meaning that the remaining 16 million doses have to be reserved as the second dose for those who have already received their first Sinovac injection. Meanwhile Pfizer stocks have not been used up so quickly, and it is only natural and logical to use up the Pfizer vaccine for those who are coming in for the first vaccination dose. This point has been clarified by both Minister Khiary and Pharmaniaga. Sinovac will still be available at private healthcare centers for those wishing to use it, clearly showing that the Ministry of Health is happy with its efficacy and continued use. It is important not to confuse a logistical issue with vaccine efficacy since such misunderstanding can hinder efforts to encourage people to come in for vaccination.

In conclusion the medical literature shows clearly that both Sinovac and Pfizer are very effective against serious Covid-19, but are less effective at preventing mild disease. This point is important to rally the public to maintain SOPs even after vaccination. Those vaccinated can still catch mild or asymptomatic Covid-19 and transmit the disease to others, so social distancing and SOP must be continued to combat Covid-19 spread.

 

Dr Ong Hean Teik FRCP, FACC, FESC, FAMM

Consultant Cardiologist, Penang, Malaysia.

Email: [email protected]

 

 

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READER COMMENTS BELOW

33 Responses to “Sinovac or Pfizer vaccines equally effective against Covid-19 infection”

  • So is Dr Ong saying that the Sinovac is more effective than the Pfizer, which has been massively reported as causing infertility issues, serious injuries and even death?

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  • 嘛弥贝咪鸿:

    “ 虽千万人吾往矣!”

    云山 苍苍, 江水泱泱,Dr Ong 之风, 山高水长。

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  • Singaporeans R Free Riders:

    Dear Dr Ong,
    We Singaporeans never trust CCP.

    Since you said it is effective, why not you and your family and friends go for SINOVAC ?

    SAF say lead by example. Show us.

    Whether it is Americunts or Cheenacunts, cunts are cunts and everyone for their own interest. You trust them you die faster.

    In Money We Trust, that is Americunts and Cheenacunts stance for you.

    金球獎最佳女導演趙婷: 中國是充滿謊言的國家 (China is full of lies/shit)
    https://www.thenewslens.com/article/148107

    GE2024.PAP.Guarantee.Win.and.Huat.Again
    Majullah $PAP$ $PAP$ Huat$ Huat$ Huat$

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  • What say Paul Tambyah ?:

    If sg doctors and consultants including Paul Tambyah speak the truth = under pressure from gov.

    Yet Dr Ong = the truth. The real truth . Yeah right . Yeah sure.

    Maybe under pressure also ? Maybe like techie his wife also from CHINA ?
    Maybe also 收左錢 ?

    Lim Guan Eng property case illustrate ambiguity.

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  • MarBowling:

    At least this Dr Ong has come out quickly to CLARIFY on the online rumors about Sinovac and all the misleading reports, UNLIKE our World Class Minister Ong Toh who keeps on TKSS all day LOONG!

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  • opposition dude:

    Whether Sinovac is good or bad remains to be seen. What we would all love to know is how effective is it against the Indian variant of the virus that is ravaging worldwide? Only Chile was surveyed it seems.

    Just let all te companies continue working on their vaccines. Just like with electronic stuff we use like smartphones and laptops, medicines and vaccines need time to be finetuned too. So as long as we are all stuck on the island we can et jabbed anytime since we aren’t leaving home anyway. So no need kan cheong spider quickly sign up to be jabbed hor, wait until next year also not too late.

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  • Harder Truths:

    How did the establishment come up with these numbers? Too good to be true – yet contradict other data from other countries and the basic fact that transmission will still happen. I call BS to the claims.

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  • Anti-vaxxer in the room:

    So there are still many anti-vaxxers hiding in the toilet, dare not come out.
    Biden took Pfizer; Xi JinPing took SinoPharm or SinoVac.
    So the 2 most powerful men in the world are telling you it does not really matter.
    Do not try to be a scientist/immunologist by reading up on Internet/Whatsapp like GMS and TKL. It is a fools’ errand.
    Vaccines work, period,–it is the only solution to your hiding in the toilet problem.
    ”’”Fear is the path to the Dark Side. Fear leads to anger, anger leads to hate, hate leads to suffering.””
    –Yoda

    Tech: Yeah, repeat that to the families of those who are now either ashes or 6-feet underground.

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  • Billy ma:

    Good for you.

    No need convinced me, I got Pfizer already so it really doesn’t matters to me.

    But you need to get your message to people who got no choice but.

    Anyway, any vaccine is better than no vaccine.
    65% is better than 0% protection.

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  • 4 million diedcovid:

    Exactly, repeat this to the 4.08 million that have died of covid.
    Anti-vaxxers are in denial of these 4 million plus deaths—they think it
    will not hit them if they hide in the toilet.
    If vaccine is good for Biden and Xi, why is it not good for anti-vaxxer?
    Three words—FEAR,FEAR,FEAR.
    Misplaced Fear!
    4 million confirmed Covid death vs how many CONFIRMED vaccine death?
    Do your math.
    PS—do not get your confirmed vaccine death from anti-vaxxer websites.

    Anti-vaxxer in the room:
    So there are still many anti-vaxxers hiding in the toilet, dare not come out.
    Biden took Pfizer; Xi JinPing took SinoPharm or SinoVac.
    So the 2 most powerful men in the world are telling you it does not really matter.
    Do not try to be a scientist/immunologist by reading up on Internet/Whatsapp like GMS and TKL. It is a fools’ errand.
    Vaccines work, period,–it is the only solution to your hiding in the toilet problem.
    ”’”Fear is the path to the Dark Side. Fear leads to anger, anger leads to hate, hate leads to suffering.””
    –Yoda

    Tech: Yeah, repeat that to the families of those who are now either ashes or 6-feet underground.

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  • dave:

    ‘Singaporeans R Free Riders:
    July 18, 2021 at 10:31 am (Quote)

    Dear Dr Ong,
    We Singaporeans never trust CCP.’

    Just speak for yourself, asshole. You don’t represent all Singaporeans.

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  • PAP mandate strong:

    https://www.google.com/amp/s/www.zaobao.com.sg/realtime/china/story20210717-1170298%3famp

    中国发现首例人类感染猴B病毒致死病例

    Earlier also a case of bird flu.

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  • xoxo:

    Angmohs tua kee say their vaccines tua kong.
    China never boast actually?

    But both not 100 pct certainty still.
    Even SAJID JAVID OF UK KENA INFECTED AGAIN AFTER FULLY VACCINATED.
    He sure never use CHINA VACCINE.

    BUT SG PAPple chiak kantang say SINOVAC not official vaccine.
    Buy yourselves at own risk.

    The most worrisome thing is to see govt of Sinkaput say die die must turn pandemic into ENDEMIC.
    And,say older sgs if not vaccinated kena fatal infection not govt ‘s problem?
    Why tbey dont want to vaccinate?

    This old uncle ask govt WHY MUST MAKE PANDEMIC INTO ENDEMIC when VIRUS DELTA spreading like australian bush fires?

    Why so hurried,then karang-kabok now?

    Daft PAPple choose to remain stubbornly stupid.

    What can we say?

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  • China Not Boastful?:

    xoxo: Angmohs tua kee say their vaccines tua kong.
    China never boast actually?

    China never boast? Go to any Chinese social media app like 抖音,快手,微博,微信 and you can see how boastful they are. These articles remain circulating in the app (not deleted) because they are approved. They keep boasting they are best at handling the pandemic. So, they must have allowed it to affect the whole world then (cancelling internal flights while with the help of WHO insisted flights to other nations should not be cancelled).

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  • xoxo:

    @China Not Boastful

    I am referring to their vaccine,Sinovac specifically in my post.
    Hope you read n interprete correctly.
    As for your info on social media,you may have your point.

    Cheerio.

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  • k:

    China Not Boastful?:
    July 19, 2021 at 10:20 am (Quote)

    They keep boasting they are best at handling the pandemic.

    They have contained the virus in their own country. No more virus in China. Only imported cases. They have earned the right to boast about it.

    You not happy? So what?

    Tech: Absolutely correct. China has earned the right to boast about its achievements in containing the C19. I am sure that the PAPies would do the same, if (ever) they are given the chance. As a matter of fact, they were quite close, until the KTV fiasco gave them one tight slap.

    Which reminds me of a Jacky Chung’s song, So near yet so far (这么近那么远). lol

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  • fpc:

    rubbish. Chile won’t see a spike in death rate after vaccinating itself with the chinese vaccine at 65% population

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  • Dorothy:

    Indonesia and Thailand uses sinovac and sinopharm as their vaccines. Now you see their death rates and infection rates escalating high. Poor protection from the vaccine, probably half of it fake. Indonesia is now epicenter for Covid. Singapore govt. did the right thing not to use sinovac from china but Pfizer and Moderna instead. Likewise, all these neighbouring countries are seeking Pfizer/Moderna vaccines and discarding sinovac once available. Big mistake to trust chinas products in the first place.

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  • China got rice:

    “The victim, …, was the first documented human case of the virus in China.”

    “There have been fewer than 100 reported human infections of herpes B since the first case of primate-to-human transmission in 1932, many of them in North America.”

    knn. The zaobao headline makes it sound that this is the first case in global history.

    https://www.washingtonpost.com/world/2021/07/19/monkey-b-virus-china-human/

    “In 1997, a primate researcher in New York died six weeks after a caged monkey flung a drop of liquid at her face, hitting her eye. ”

    People, please save yourselves and avoid monkeys.

    PAP mandate strong:
    https://www.google.com/amp/s/www.zaobao.com.sg/realtime/china/story20210717-1170298%3famp

    中国发现首例人类感染猴B病毒致死病例

    Earlier also a case of bird flu.

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  • Singaporeans R Free Riders:

    Billy ma:
    Anyway, any vaccine is better than no vaccine.
    65% is better than 0% protection.

    exactly..exactly… Oppie has no solution except to oppose for the sake of opposition.

    GE2024.PAP.Guarantee.Win.and.Huat.Again
    Majullah $PAP$ $PAP$ Huat$ Huat$ Huat$

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  • Singaporeans R Free Riders:

    dave:
    ‘Singaporeans R Free Riders:
    July 18, 2021 at 10:31 am (Quote)

    Dear Dr Ong,
    We Singaporeans never trust CCP.’

    Just speak for yourself, asshole. You don’t represent all Singaporeans.

    You are a closet communist ?

    So Oppie are in collusion with CCP ?

    GE2024.PAP.Guarantee.Win.and.Huat.Again
    Majullah $PAP$ $PAP$ Huat$ Huat$ Huat$

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  • Singaporeans R Free Riders:

    Dorothy:
    Indonesia and Thailand uses sinovac and sinopharm as their vaccines. Now you see their death rates and infection rates escalating high. Poor protection from the vaccine, probably half of it fake. Indonesia is now epicenter for Covid.

    Well said.. clap .. clap .. China is full of fakes, lies and shits.

    Dorothy:
    Singapore govt. did the right thing not to use sinovac from china but Pfizer and Moderna instead. Likewise, all these neighbouring countries are seeking Pfizer/Moderna vaccines and discarding sinovac once available.

    Yes, yes, yes. Praise be with the PAP.
    Singapore government did the right thing to stop Sinovac because PAP degrees are real unlike demoncratic ROc Taiwan President whose PhD degree is fake.

    Dorothy:
    Big mistake to trust chinas products in the first place.

    Yes, never trust China.

    Oppie supporters just want to oppose for the sake of opposing.
    They offer no solution just like Goh Meng Seng the 2 head snake.

    GE2024.PAP.Guarantee.Win.and.Huat.Again
    Majullah $PAP$ $PAP$ Huat$ Huat$ Huat$

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  • @xoxo::

    xoxo:
    @China Not Boastful

    I am referring to their vaccine,Sinovac specifically in my post.
    Hope you read n interprete correctly.
    As for your info on social media,you may have your point.

    Cheerio.

    Friends in China boasted (not from official channels) about the Chinese vaccine. They said, since the Chinese vaccines are used in many countries, so they must be good. Of course, as common citizens, my friends in China only have access to positive propagandas (not news) about the Chinese vaccines in mass media and social media. The official channels are not bragging about the Chinese to the world since they are not in a position to do so.

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  • @k::

    k: China Not Boastful?:
    July 19, 2021 at 10:20 am (Quote)

    They keep boasting they are best at handling the pandemic.

    They have contained the virus in their own country. No more virus in China. Only imported cases. They have earned the right to boast about it.

    You not happy? So what?

    The CCP has certainly earned the right to boast about controlling truthful information about the virus. Despite taking drastic effort to contain it, they still have to report some of the cases. Currently, there are reported cases in Yunnan, Ruili and Jiangsu, Nanjing.

    It was reported that during the last 2 days flooding in Henan, Zhengzhou, commuters stranded in mass transit lines (underground with water up to the chest) tweeted in Chinese Weibo to seek help. However, their tweets were quickly deleted as a form of self-censorship of negative news. Likewise, similar self-censorship is routine carried out on truthful (but negative to the party) news regarding the virus situation and vaccine administration.

    So, you are happy how your Chinese comrades are being treated in China?

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  • Richard Ong:

    If China vaccines good, how come many countries don’t buy their vaccines? Poor countries can’t afford are forced to use China free vaccines, in the end so many their doctors and nurses and citizens kena infection by Covid 19! Hope Sporeans beware, your life belong to you, not China! Alot people tell you China vaccines is good but they quietly go take Pfizer vaccines. You kena covid your problem, they happily collect China money!

    Tech: So doctors and nurses and frontline workers in Sinkieland don’t kenna bitten after their vaccination?

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  • Soccerbetting2:

    Reported on Straits Times :Quote-”SINGAPORE – An unvaccinated 83-year-old Singaporean woman has died from complications due to Covid-19 infection on Saturday (July 24).

    She resided at Bukit Merah View, and was linked to the Block 121 Bukit Merah View cluster, the Health Ministry (MOH) said.

    The woman developed symptoms on June 16 but did not seek medical attention until she was taken to the National University Hospital on June 18.

    She had a history of hypertension and hyperlipidaemia.

    A total of 37 people have died from complications due to Covid-19 infection here.

    Two new clusters were also reported by MOH on Saturday.

    One of the active clusters is at Samy’s Curry Restaurant, with a total of eight cases linked to it.

    The other new cluster is linked to an individual case, and that cluster has a total of four cases.

    There are currently 26 active clusters, ranging between three and 741 infections.

    There is continuing evidence that vaccination helps to prevent serious disease if infected.

    Over the last 28 days, 11 local cases required oxygen supplementation, were admitted to ICU or died.

    Of these, six were unvaccinated, five were partially vaccinated and none was fully vaccinated.”Unquote.

    Response : Another dead ! Very fast with NDP cekebrations,there will be more cases and more deaths ! So next time Singapore may break record with the highest corona virus in region if such NDP is not stopped off.And what happen to the petition by somebody to stop NDP ? No further news or already get bribe off by those evil women corrupted women wing from charity donating charity funds ? Pui!

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  • Merlion:

    In Singapore, people are free to choose Sinovac. But so far the number choosing Sinovac is disappointing. Most people in Singapore still prefer Pfizer and moderna despite hard-sell from people like TKL, GMS and Dr Ong HT. Not sure TR Emeritus can do better job than them. You all can argue what you want, reality is most people in the world don’t trust China vaccines. Even some poor countries that get donated vaccines from China also suspend using the Chinese vaccines.

    Tech: It is a case of to each his own. Generally, Sinovac is safer as it uses inactivated virus (a tested technology) while those mRNA vaccines fiddle with DNA and has not been fully tested. So no good or bad, just after taking, which side effects more jialut.

    As far as China is concerned, I noticed most who commented on TRE on China are living in the past and have no idea how far and great China has become. My advise is, pay a visit to China and see and learn for yourself.

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  • “An unvaccinated 83-year-old Singaporean woman has died from complications due to Covid-19 infection on Saturday (July 24).”

    There you go again, MSM still trying to instill fear into the datfs so the LEEders can achieve their aim of a fully vaccinated population so that they can brag to the world how great their plan is.

    Use your brains lar, this poor lady has a history of this and that, if she had been vaccinated, she would have died from the vaccination, still got change to kenna the C19 meh?

    Besides, given her super-old age and medical conditions, she could also have died even if she is vaccinated and had not already died from the vaccination.

    As a matter of discussion, vaccinated or not, she could also have died even if a mosquito or ant have bitten her. Not a remote possibility right?

    I am just waiting for more MSM bullshit when another fully vaccinated dies from the C-19. Wonder how they would spin it this time.

    Any guesses?

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  • China GoonDu:

    Yes, many here worship Emperor Xi.
    Propagandist can lie; goondoos can believe.
    Science and data cannot be hidden for long.
    The truth always appear where science and data are concerned.
    If China-vaccines are superior they would have published their data long time ago.
    Remember they told the whole world they can build a hospital in a week.
    Illegitimate regimes have a very ‘strong need’ to blow their own horns in any accomplishment; e.g even though they landed on the moon 50 years after Uncle Sam—they thought it was a big deal.
    Sadly not all in Sinkiestan can see through the bullshit.
    Some like CCP-flag-waving TKL choose not to.

    Richard Ong:
    If China vaccines good, how come many countries don’t buy their vaccines? Poor countries can’t afford are forced to use China free vaccines, in the end so many their doctors and nurses and citizens kena infection by Covid 19! Hope Sporeans beware, your life belong to you, not China! Alot people tell you China vaccines is good but they quietly go take Pfizer vaccines. You kena covid your problem, they happily collect China money!

    Tech: So doctors and nurses and frontline workers in Sinkieland don’t kenna bitten after their vaccination?

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  • Soccerbetting2:

    Reported on Straits Times :Quote-”SINGAPORE – All households here will receive Covid-19 self-test kits soon, as Singapore scales up its testing regime and works to live with the coronavirus.

    These antigen rapid test (ART) kits, which are now widely available at retailers, are being distributed by the Government to households and will be rolled out first to those near large Covid-19 clusters, said Finance Minister Lawrence Wong in Parliament on Monday (July 26).

    “We’re starting with those who live near markets where large clusters have been identified. We will progressively scale up and distribute to everyone in Singapore,” said Mr Wong, who co-chairs the multi-ministry task force tackling the pandemic.

    As these kits are being distributed, Singapore will also be rolling out other ways of testing for the virus.

    Mr Wong said that these include breathalyser tests in Parliament before each sitting, in addition to similar tests at Singapore’s checkpoints, and waste-water surveillance in estates.

    “Regular testing, and the social consciousness to get ourselves tested regularly, will protect us and keep us safe as we transit to the new normal,” he said.

    Mr Wong and his two co-chairs – Health Minister Ong Ye Kung and Trade and Industry Minister Gan Kim Yong – spoke in Parliament on Monday to give an update about the Government’s response to Covid-19.

    Stressing that everyone has a role to play in Singapore’s controlled and phased reopening, Mr Wong said that safe management measures will remain relevant and important for some time.

    Mask-wearing may well be one of the last rules to go in the new normal, said the minister. While Singapore may consider dispensing with masks when outdoors, Mr Wong pointed out that it would still make sense to wear them in indoor, enclosed environments, where transmission risks are greater.

    Basic safety measures like wearing a mask and keeping a safe distance from others can help reduce transmission effectively, he said. “So we must stay disciplined and continue to maintain these practices, even as we transition towards the new normal.”
    ..”Unquote .

    Response : How come no dateline for distribution of “free” antigen rapid test kit to household ,where to collect ? Pui! Singapore need better information system but first fired off information minister Josephine first ! And why Temasex so long already haven’t distributed “free” mask ? Corona virus spiking also never distribute more mask but want everybody to wear mask all the time ,is that correct ? Evil b**** backside HC must be thinking one re-usable mask can last forever ? And all of you use re-usable mask can last longer than three months or not ,say it frankly out ? And temasex distribute “free mask” is not really free ! It is still public money,not HC evil backside money,temasex money or whatever ! Money is spent in a round about way ! Pui!

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  • Voiceless minority:

    Very pro chinese article from typical stupid chinese doctor with fancy degrees. Do you take us as stupid. Chinese govt paid all these medical journals. Not surpŕising when WHO is in their pocket. You are welcome to migrate yo Cina.

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  • Dr Hoe:

    Agree. Scrutinized all the trial data too. Also worked with both AZ and Pfz type technologies. Excited to see the data phase-3 trials from the vaccinated in time to come.

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