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Pfizer says its COVID-19 vaccine is 95% effective in final clinical trial results analysis

Darrell Etherington
·2-min read
An illustration picture shows vials with Covid-19 Vaccine stickers attached and syringes with the logo of US pharmaceutical company Pfizer and German partner BioNTech, on November 17, 2020. (Photo by JUSTIN TALLIS / AFP) (Photo by JUSTIN TALLIS/AFP via Getty Images)
An illustration picture shows vials with Covid-19 Vaccine stickers attached and syringes with the logo of US pharmaceutical company Pfizer and German partner BioNTech, on November 17, 2020. (Photo by JUSTIN TALLIS / AFP) (Photo by JUSTIN TALLIS/AFP via Getty Images)

Drugmaker Pfizer has provided updated analysis around its COVID-19 vaccine Phase 3 clinical trial data, saying that in the final result of its analysis of the 44,000-participant trial, its COVID-19 vaccine candidate proved 95% effective. This is a better efficacy rate than Pfizer reported previously, when it announced a 90% effectiveness metric based on preliminary analysis of the Phase 3 trial data.

This result also follows a preliminary data report from Moderna about their own Phase 3 trial of their vaccine candidate, which they reported showed 94.5% effectiveness. Pfizer and partner BioNTech's vaccine is an mRNA-based preventative treatment, similar to the Moderna one, and now it looks like they should be roughly similar in efficacy -- at least in the early offing, based on a limited sample of total cases and prior to peer review by the scientific community, which is yet to come.

The Pfizer data in its final analysis shows that among a total of 170 confirmed COVID-19 cases so far among the 44,000 people who took part in the study, 162 cases came from the placebo group while only eight were from the group of those who received the actual vaccine candidate. The company also reported that nine out of 10 of the severe cases among those who were infected occurred in the placebo group, suggesting that even in the rare occasion that the vaccine didn't prevent contraction of COVID-19, it helped reduce its severity.

This should help Pfizer make its case that it be granted an Emergency Use Authorization (EUA) from the U.S. Food and Drug Administration (FDA) to be able to provide the vaccine early pending full and final approval as an emergency measure. Earlier this week, the company reported that it has already collected two months' worth of follow-up data about participants in its trial, which is a required component for said approval, and it's pursuing it with hopes of seeking that EUA "within days." The company intends to ramp production of its vaccine beginning later this year, with plans of achieving a run rate of up to 1.3 billion doses by next year.