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Impulse in Estadão: Combining vaccines is urgent and will lead us to collective immunity more quickly

The combination of vaccines consisting in the application of the second dose of one vaccine after the application of the first dose of another has been used in some countries to speed up the vaccination process and achieve collective immunity. 

International clinical studies indicate that applying the second dose of Pfizer vaccine to those who have received the first dose of AstraZeneca vaccine is a safe and effective strategy against COVID-19. Countries like Portugal, Chile, Germany, France and Denmark already recommend the combination of AstraZeneca and Pfizer vaccines. The measure is not yet authorized in Brazil.

The unprecedented study by Impulso Gov shows that, given the current vaccination schedule and the supply of AstraZeneca scheduled for the coming months, applying a second dose of Pfizer to those who received the first dose of AstraZeneca would impact more than 16 millions of Brazilians, which is important for us to maintain the current pace of vaccination and avoid delays.

According to the authors of the article, Luiza Amorim, Marco Brancher and João Abreu from ImpulsoGov and Álvaro Rossi, consultant for the Municipality of Rio de Janeiro, the use of this strategy can bring us closer to the long-awaited collective immunization.

Therefore, it is important for Brazil to be aware of the forefront of international scientific evidence and adopt the combination of vaccines quickly.