WorldWhat do the US and Canada say about the 'mixed injection' of...

What do the US and Canada say about the ‘mixed injection’ of the Pfizer vaccine and the Moderna vaccine?

The Centers for Disease Control and Prevention (CDC) in the United States, when introducing the two-dose Covid-19 vaccines, Moderna and Pfizer, recommended that vaccine participants should receive 2 doses of the same type. However, in an addendum updated earlier this year, the CDC authorized the alternative injection of Pfizer and Moderna at dose 2 in “exceptional situations”.
Specifically, the CDC instructs: “In exceptional situations where it is not clear which mRNA vaccine was given in the first dose, or if that vaccine has been exhausted, the second dose of any vaccine can be given. What Covid-19 mRNA vaccine is available, the minimum time between 2 doses is 28 days, to complete the vaccination… In these cases, if two doses of the two Covid-19 mRNA vaccines have been administered. If different, no additional dose is required.

Mobile vaccination program in California, USA.

According to Professor Thomas Russo, head of the infectious disease department at Jacobs College of Medicine and Biomedical Medicine, during the early deployment of the vaccine in the US, there were many confusions that led to mixed injections of Pfizer and Moderna, but did not cause the disease. any severe reaction. Many other experts also say that it is almost impossible to distinguish the effectiveness and safety of the two vaccines. To date, there have been no reports of side effects from mixing vaccines.

Russo said the two mRNA vaccines had similar safety profiles and that “there won’t be any problems in safety or effectiveness if the mRNA technology vaccine is mixed”.
John Swartzberg, a professor at the UC Berkeley School of Public Health, also advises: “Get Moderna without Pfizer and vice versa, it’s fine.”

What do the US and Canada say about the 'mixed injection' of the Pfizer vaccine and the Moderna vaccine?  - photo 2

Mixing of Pfizer and Moderna vaccines is allowed in many countries.

In fact, Canada, led by the state of Ontario, has allowed the replacement of Pfizer and Moderna since June 2021 and there have been no problems so far.

At the beginning of June, Canada’s National Advisory Committee on Immunization (NACI) updated its guidelines on the Covid-19 vaccine, according to which people who have received the first dose of Moderna or Pfizer can receive the second dose. inject one of these two types. “If a product of the same type is not available or it is not clear which vaccine has been administered, the mRNA vaccines are considered to be interchangeable,” the NACI states.

“Both Pfizer and Moderna are mRNA vaccines. They’re not the same thing, but they’re similar and you can totally get a dose of each,” explains Dr. Deena Hinshaw, chief medical officer for the province of Alberta.

The Manitoba province website also agrees, saying: “There is no need to wait for Pfizer for a second booster and Moderna can be used if it is available to be given earlier. Pfizer and Moderna are both safe. safe, effective and interchangeable”.


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