Thursday, October 21

Covid vaccine: what does the percentage of effectiveness of the immunization mean and how is it measured

  • Guillermo Olmo @BBCgolmo
  • BBC World News

Person receiving an injection.


The data that are available invite optimism.

Covid-19 vaccine effectiveness numbers are piling up in the headlines, raising hopes for a world eager to overcome the nightmare of the pandemic.

The last known figure was the 92% efficacy that an article published in the scientific journal The Lancet attributes to the Russian vaccine Sputnik-V, which adds to the 95% reported by the one developed by Pfizer-BioNtech, 94.1% of that of Moderna and 70% of that of the University of Oxford and AstraZeneca.

These are all encouraging data that suggest that mass vaccination programs should serve to bring the SARS-Cov-2 coronavirus under control, which has already caused more than two million deaths in the world, and an unprecedented health and social crisis in recent history.

Unlike those developed by Pfizer and Moderna, which are based on a novel technology that allows the body to be exposed to a fragment of the coronavirus RNA, Sputnik-V uses a common cold virus that is modified to act as a vector and provoke a controlled response of the immune system that will be repeated if it detects the presence in the body of SARS-Cov-2

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