Efficacy of Pfizer vaccine remains high 6 months after 2 doses

The companies Pfizer e BioNTech reported on Thursday, 1st, that their vaccine against covid-19 remains highly effective for at least six months after the second dose is administered. Pharmaceuticals said that immunization also works against the South African variant of coronavirus Sars-CoV-2.




Efficacy of Pfizer anti-covid-19 vaccine remains high 6 months after 2 doses, indicates analysis

Photo: Lucy Nicholson / Reuters

The findings come from the follow-up of the more than 46,000 volunteers who participated in phase 3 of the vaccine’s clinical trials. Among them, 927 cases of covid-19 were registered until March 13, indicating an efficacy of 91.3%, calculated for the period between seven days and up to six months after the second dose: 850 were from the group that received a placebo and 77 received the vaccine.

According to the new analysis, the vaccine was 95.3% effective in protecting against the occurrence of severe disease, as defined by the United States’ drug regulatory agency, the FDA. From the evaluated group, more than 12 thousand participants have been followed for at least six months after the second dose, reinforcing the safety profile of the immunizer.

“It is an important step to confirm the high effectiveness and good safety data so far, especially in the long-term follow-up,” said BioNTech’s CEO Germany, Ugur Sahin, in the note.

The study also showed that the vaccine appears to work similarly against the virus variant detected in South Africa, where this strain is the majority and where it showed 100% effectiveness, although in a smaller group, with only 800 participants.

“The high effectiveness of the vaccine seen for up to six months after a second dose and against the variant prevalent in South Africa offers more confidence in the overall effectiveness of our vaccine,” said the CEO of Pfizer, Albert Bourla.

The vaccine was the first licensed in the West and is a key part of immunization campaigns that take place in much of the world.

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