AstraZeneca manufacturing error clouds vaccine study results

In a surprise, the group of volunteers that got a lower dose seemed to be much better protected than the volunteers who got two full doses.

Updated - November 26, 2020 08:48 am IST

Published - November 26, 2020 07:58 am IST - London

An illustration picture shows vials with Covid-19 Vaccine stickers attached and syringes, with the logo of the University of Oxford and its partner British pharmaceutical company AstraZeneca, on November 17, 2020.

An illustration picture shows vials with Covid-19 Vaccine stickers attached and syringes, with the logo of the University of Oxford and its partner British pharmaceutical company AstraZeneca, on November 17, 2020.

AstraZeneca and Oxford University have acknowledged a manufacturing error that is raising questions about preliminary results of their experimental COVID-19 vaccine .

A statement describing the error on Wednesday came days after the company and the university described the shots as “highly effective” and made no mention of why some study participants didn’t receive as much vaccine in the first of two shots as expected.

In a surprise, the group of volunteers that got a lower dose seemed to be much better protected than the volunteers who got two full doses.

In the low-dose group, AstraZeneca said, the vaccine appeared to be 90% effective. In the group that got two full doses, the vaccine appeared to be 62% effective. Combined, the drugmakers said the vaccine appeared to be 70% effective.

But the way in which the results were arrived at and reported by the companies has led to pointed questions from experts.

The partial results announced on November 23 are from large ongoing studies in the U.K. and Brazil designed to determine the optimal dose of vaccine, as well as examine safety and effectiveness. Multiple combinations and doses were tried in the volunteers. They were compared to others who were given a meningitis vaccine or a saline shot.

0 / 0
Sign in to unlock member-only benefits!
  • Access 10 free stories every month
  • Save stories to read later
  • Access to comment on every story
  • Sign-up/manage your newsletter subscriptions with a single click
  • Get notified by email for early access to discounts & offers on our products
Sign in

Comments

Comments have to be in English, and in full sentences. They cannot be abusive or personal. Please abide by our community guidelines for posting your comments.

We have migrated to a new commenting platform. If you are already a registered user of The Hindu and logged in, you may continue to engage with our articles. If you do not have an account please register and login to post comments. Users can access their older comments by logging into their accounts on Vuukle.