Study shows efficacy of Pfizer and AstraZeneca vaccines against Delta variant – Prime Time Zone


Research points out, however, that more robust protection is only achieved after two doses of immunizing agents; Brazil should only achieve collective immunity in the first half of 2022

ROBERTO CASIMIRO/FOTOArena/ESTADÃO CONTENTA study shows that two doses of Pfizer’s compound resulted in 88% efficacy compared to the Delta variant

A study released on Wednesday, 21, showed that two doses of vaccines from Pfizer and yes AstraZeneca are almost as effective against Delta variant do coronavirus and against the Alpha variant, dominant throughout the pandemic. The research published in the New England Journal of Medicine emphasizes, however, that a single dose of these immunizers is not enough for a more robust protection. The study points out that two doses of Pfizer’s compound resulted in 88% effectiveness over the Delta variant, first registered in India and considered to be more transmissible. In the case of AstraZeneca, the protection was 67%. Both vaccines are currently used in Brazil, being applied with an interval of three months between doses. The reduction of this period, for now, is not recommended by the Ministry of Health, which already registers more than 100 cases of the new strain in the country.

This Wednesday, 21, Brazil reached the mark of 545,000 killed by the Covid-19. Meanwhile, the number of infected is approaching 19.5 million. According to a survey by the University of São Paulo (USP), the Federal University of Rio de Janeiro (UFRJ) and the State University of Rio de Janeiro (UERJ), at the current rate, the country should only reach the goal of immunizing 90% of adults, characterizing the so-called collective immunity, in the first quarter of 2022. The former coordinator of the National Immunization Program (PNI), Carla Domingues, believes that by the end of the year, the entire population over 18 years old will have received at least one dose.

“Unfortunately, we are seeing this distance between the first and second dose. We have almost 90 million people who have received the first dose, about 40 million people who have received the second dose. In other words, only 15% of the population completed the vaccination schedule. Vaccinated population means a complete scheme, with two doses,” he said. The Ministry of Health increased to 63.3 million the forecast of doses to be delivered by the contracted laboratories in August this year. The previous projection was 60.5 million units. On Wednesday night, a batch with more than 1 million Pfizer vaccines landed at Viracopos airport, in Campinas.

*With information from the reporter Camila Yunes