Then the states of Rio and Sierra adopted the same measure.
The decision was made by the municipality of Rio and endorsed by a panel of researchers, without the support of the Ministry of Health, which recommends pregnant and postpartum women take the first dose of AstraZeneca and wait until 45 days after delivery to complete the vaccination schedule.
Now, those women who received their first dose of Astrazeneca, more than 12 weeks ago, will be able to mix their vaccinations and take their second dose of Pfizer.
The decision sparked another discussion: Is it possible and safe to combine different vaccines? Watch the report in the video above.
In Spain, a survey – which has not yet been reviewed by other scientists – showed good results. Volunteers who took the first dose of Astrazeneca, and two weeks later, the second dose of Pfizer, had a significant increase in the production of antibodies that, in vitro, were able to inactivate the coronavirus.
In the UK, Oxford researchers who mixed doses came to a similar conclusion. They caution, however, that trials have already shown an increased risk of side effects with this combination immunization regimen.
None of the studies, neither Spanish nor English, included pregnant women.
In the Philippines, another trial may be of interest to Brazil, combining CoronaVac with six other vaccines: Pfizer, Moderna, Janssen, Astrazeneca and Sputnik. But, is this enough to change the NIP and allow synthesis?
Thousands around the world are rapidly getting mixed vaccines, such as in Canada, Portugal, and South Korea.
In Germany, Chancellor Angela Merkel took the first dose of Astrazeneca and the second of Moderna, another vaccine produced using mRNA technology, just like Pfizer.
In the United States, where 70% received the first dose and 46% were fully immunized, there is already a study to see if it would be beneficial to give a third booster dose with a different vaccine.
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Charlotte Whitmore is a contributor at Mediarunsearch.co.uk, covering a broad range of topics including news, politics, business, technology, sport, entertainment, and lifestyle. She focuses on delivering clear, balanced reporting and practical information that helps readers stay informed about current events and emerging developments. Her work highlights stories that matter to everyday audiences, with an emphasis on accuracy, relevance, and accessible journalism that keeps readers connected to the issues shaping the UK and beyond.