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TUESDAY, JUNE 17, 2025
Moderna says Covid-19 vaccine protection wanes, makes case for booster

Coronavirus chronicle

Reuters
16 September, 2021, 09:40 am
Last modified: 16 September, 2021, 09:41 am

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Moderna says Covid-19 vaccine protection wanes, makes case for booster

Experts said the difference is likely due to Moderna's higher dose of messenger RNA (mRNA) and the slightly longer interval between the first and second shots

Reuters
16 September, 2021, 09:40 am
Last modified: 16 September, 2021, 09:41 am
Vials with a sticker reading, "Covid-19 / Coronavirus vaccine / Injection only" and a medical syringe are seen in front of a displayed Moderna logo in this illustration taken October 31, 2020. Photo :Reuters
Vials with a sticker reading, "Covid-19 / Coronavirus vaccine / Injection only" and a medical syringe are seen in front of a displayed Moderna logo in this illustration taken October 31, 2020. Photo :Reuters

New data from Moderna Inc's large Covid-19 vaccine trial shows that the protection it offers wanes over time, supporting the case for booster doses, the company said in a news release on Wednesday.

"This is only one estimate, but we do believe this means as you look toward the fall and winter, at minimum we expect the estimated impact of waning immunity would be 600,000 additional cases of Covid-19," Moderna President Stephen Hoge said on a conference call with investors.

Hoge did not project how many of the cases would be severe, but said some would require hospitalization.

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The data stands in stark contrast with data from several recent studies that suggested Moderna's vaccine protection lasts longer than a similar shot from Pfizer Inc and German partner BioNTech SE.

Experts said the difference is likely due to Moderna's higher dose of messenger RNA (mRNA) and the slightly longer interval between the first and second shots.

Both vaccines proved to be exceedingly effective at preventing illness in their large Phase III studies.

Top News / World+Biz

Moderna / Covid -19 / Vaccine / booster

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