Pfizer shot less effective, but still protects against Indian strain – study –

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Pfizer shot less effective, but still protects against Indian strain – study – fr


PARIS – The Pfizer vaccine is slightly less effective but still appears to protect against the more transmissible Indian strain of the virus that causes COVID-19, according to a study by the French Pasteur Institute.

“Despite a slightly reduced efficacy, the Pfizer vaccine probably protects” against the Indian variant, according to the results of laboratory tests, said Olivier Schwartz, director of the institute and co-author of the study which was published on the BioRxiv website prior to peer review.

The study involved 28 health workers in the city of Orleans. Sixteen of them had received two doses of the Pfizer vaccine, while 12 had received one dose of the AstraZeneca vaccine.

People who received two doses of Pfizer saw a three-fold reduction in their antibodies to the Indian variant, B.1.617, according to the study, but were still protected.

Medical staff prepare a dose of the Pfizer-BioNTech COVID-19 vaccine at a vaccination center in Versailles, France, May 29, 2021 (STEPHANE DE SAKUTIN / AFP)

“The situation was different with the AstraZeneca vaccine, which induced particularly low levels of antibodies neutralizing” the Indian variant, according to the study.

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Patients who had had COVID-19 in the past year and people vaccinated with two doses of Pfizer retained enough antibodies to be protected against the Indian variant, but three to six times fewer antibodies than against the variant British, said Schwartz.

The study shows that “this variant … has acquired partial resistance to antibodies,” said Schwartz.

Since its appearance in late 2019 in China, the SARS-CoV-2 virus that causes Covid-19 has developed several variants, usually named for places where it first appeared, including so-called African strains. from the South and the United Kingdom.

The body of a COVID-19 victim is taken for cremation at land that has been converted to a crematorium in New Delhi, India on May 6, 2021 (AP Photo / Ishant Chauhan)

The variant first detected in India appears to be much more transmissible than previous variants.

It has now been officially registered in 53 territories, according to a report from the World Health Organization.

In an attempt to curb its spread, France and Germany have reintroduced stricter rules on arrivals from affected countries, including the United Kingdom.

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