Who Chief Scientist Warns Against ‘Mixing And Matching’ Different Covid Vaccines

In Canada, people who received the AstraZeneca vaccine as the first will receive a recommended vaccine against the Pfizer vaccine in their second vaccine. The Sinovac vaccine was developed in China and is marketed in neighboring Asian countries. Thailand plans to give medical staff who had one shot of the SinovAC vaccine an Astraveneca vaccine for the second shot.

In the UK, the delay for the second dose is 12 weeks compared to the recommended 3-4 weeks. Clinical trials with the Case-Moderna and Pfizer vaccines suggest that if we need two doses, we need to get them in a certain amount. 

If you deviate from two doses of the same vaccine, we no longer have confidence in its safety, efficacy and durability, “Dr Poland said. In an effort to attract more people to the first dose of vaccine, some countries have delayed the second dose. 

a man and a woman holding a test tube
Photo by Artem Podrez on

On Monday, the world health organization chief scientist called mixing the doses of COVID-19 vaccines a dangerous trend, reminding him of the limited data available on the effects of administering two different vaccines – for example, the growing trend of AstraZeneca vaccines followed by a second dose from Pfizer. In a briefing Tuesday, the chief scientist of the World Health Organization warned against mixing and matching different vaccines. He said there are not enough data to show they are effective at protecting against the virus. We are in a data and evidence-free zone of confusion and agreement, “he said.

The comments were made in connection with a conversation about booster doses, and has sought more clarity on the position. The issue has caused concern as Canadians have been told that the vaccine mix is acceptable on the basis of guidelines from the National Advisory Committee on Immunization (NACI), but federal and provincial officials have been quick to defend Canada’s approach, with health experts suggesting that decisions should be made with the health and safety of people in mind. Manitoba’s top provincial health official, Dr. Brent Roussin, has supported the WHO approach that has worked with other vaccines in the past.

The world health organization’s chief scientist clarified his comments later on Twitter, saying that people should follow public health advice and not decide for themselves whether vaccines should be mixed or taken in extra doses. Individuals should not decide for themselves, but for health authorities on the basis of available data. 

The mixing and matching of COVID-19 vaccines is an immunization method in which recipients are given two doses of a vaccine from different manufacturers. Canada is one of several countries to combine approved vaccines.

The chief scientist at the World Health Organization, Dr. Soumya Swaminathan, warned Monday against mixing and matching first-dose and second-dose COVID-19 vaccines, calling this a dangerous trend and saying there was a lack of data on the effects of the practice. He also cautioned against combining different Covid-19 vaccines, as some studies suggest a cocktail approach can yield positive results.

The World Health Organization has received many requests from people who say they are taking a dose and plan to take one. We have received many inquiries from people who say they have taken one and plan to take another.

“We are in a data-free, evidence-free mixing and matching zone, and ” she said in an online briefing. “It’s a chaotic situation in countries where people are starting to decide whether to take a second, third or fourth dose,” she added in the briefing. The scientist said while initial data suggests that mixing vaccines is the best approach, the long-term effects remain unknown.

Preliminary results of an Oxford University study on 12 May showed that the combination of Pfizer, Biontech and AstraZeneca COVID-19 vaccines increased the frequency of mild to moderate adverse events. Deek said the advice was based on Pfizer’s growing offering and the risk of vaccine-induced blood clots associated with Astra Zeneca.

Swaminathan cited data from the UK and Germany showing that mixing and matching vaccination programs produced fewer side effects than two doses of the same vaccine. Many opted for the second dose of the mRNA vaccine after the researchers collected the data. “I think that the idea that citizens will get many different doses of different vaccines is beyond public health.

On Sunday, the world population day, Prime Minister Yogi Adityanath caused a row over the publication of a new population policy for the state. The policy stipulates that people with more than two children are excluded from participating in local elections, applying for government jobs, and receiving subsidies. India is under pressure in family planning because data shows that couples do not have more than two children on average, told the center in a affidavit signed by the minister of health of the family planning division in December 2020.

Infectious disease experts are weighing whether people who received Johnson’s simple vaccine should get a booster from Pfizer Moderna, an RNA-based vaccine reportedly more effective against the highly infectious delta variant. Dr Soumya Swaminathan made the comments in a recent online briefing. 

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